ADDED: Stacked pin notation support

Implement bracket notation for stacked pins ([1,2,3], [1-4], [1,3,5-7]).
Automatic net naming proceeds based on the smallest logical pin number
in stacked groups.

Provide explode/reform commands in symbol editor for conversion.
Supports arbitrary ranges including BGA alphanum ranges like
[AA1-AA3,CD14-CD22]

Adds some additional QA and trace logging

Fixes https://gitlab.com/kicad/code/kicad/-/issues/2004

common/string_utils.cpp

@@ -38,6 +38,7 @@
 #include <fmt/chrono.h>
 #include <wx/log.h>
 #include <wx/regex.h>
+#include <wx/tokenzr.h>
 #include "locale_io.h"
 
 
@@ -1503,3 +1504,124 @@ wxString NormalizeFileUri( const wxString& aFileUri )
 
     return retv;
 }
+
+
+namespace
+{
+    // Extract (prefix, numericValue) where numericValue = -1 if no numeric suffix
+    std::pair<wxString, long> ParseAlphaNumericPin( const wxString& pinNum )
+    {
+        wxString prefix;
+        long     numValue = -1;
+
+        size_t numStart = pinNum.length();
+        for( int i = static_cast<int>( pinNum.length() ) - 1; i >= 0; --i )
+        {
+            if( !wxIsdigit( pinNum[i] ) )
+            {
+                numStart = i + 1;
+                break;
+            }
+            if( i == 0 )
+                numStart = 0; // all digits
+        }
+
+        if( numStart < pinNum.length() )
+        {
+            prefix = pinNum.Left( numStart );
+            wxString numericPart = pinNum.Mid( numStart );
+            numericPart.ToLong( &numValue );
+        }
+
+        return { prefix, numValue };
+    }
+}
+
+std::vector<wxString> ExpandStackedPinNotation( const wxString& aPinName, bool* aValid )
+{
+    if( aValid )
+        *aValid = true;
+
+    std::vector<wxString> expanded;
+
+    const bool hasOpenBracket  = aPinName.Contains( wxT( "[" ) );
+    const bool hasCloseBracket = aPinName.Contains( wxT( "]" ) );
+
+    if( hasOpenBracket || hasCloseBracket )
+    {
+        if( !aPinName.StartsWith( wxT( "[" ) ) || !aPinName.EndsWith( wxT( "]" ) ) )
+        {
+            if( aValid )
+                *aValid = false;
+            expanded.push_back( aPinName );
+            return expanded;
+        }
+    }
+
+    if( !aPinName.StartsWith( wxT( "[" ) ) || !aPinName.EndsWith( wxT( "]" ) ) )
+    {
+        expanded.push_back( aPinName );
+        return expanded;
+    }
+
+    const wxString inner = aPinName.Mid( 1, aPinName.Length() - 2 );
+
+    size_t start = 0;
+    while( start < inner.length() )
+    {
+        size_t comma = inner.find( ',', start );
+        wxString part = ( comma == wxString::npos ) ? inner.Mid( start ) : inner.Mid( start, comma - start );
+        part.Trim( true ).Trim( false );
+        if( part.empty() )
+        {
+            start = ( comma == wxString::npos ) ? inner.length() : comma + 1;
+            continue;
+        }
+
+        int dashPos = part.Find( '-' );
+        if( dashPos != wxNOT_FOUND )
+        {
+            wxString startTxt = part.Left( dashPos );
+            wxString endTxt   = part.Mid( dashPos + 1 );
+            startTxt.Trim( true ).Trim( false );
+            endTxt.Trim( true ).Trim( false );
+
+            auto [startPrefix, startVal] = ParseAlphaNumericPin( startTxt );
+            auto [endPrefix, endVal]     = ParseAlphaNumericPin( endTxt );
+
+            if( startPrefix != endPrefix || startVal == -1 || endVal == -1 || startVal > endVal )
+            {
+                if( aValid )
+                    *aValid = false;
+                expanded.clear();
+                expanded.push_back( aPinName );
+                return expanded;
+            }
+
+            for( long ii = startVal; ii <= endVal; ++ii )
+            {
+                if( startPrefix.IsEmpty() )
+                    expanded.emplace_back( wxString::Format( wxT( "%ld" ), ii ) );
+                else
+                    expanded.emplace_back( wxString::Format( wxT( "%s%ld" ), startPrefix, ii ) );
+            }
+        }
+        else
+        {
+            expanded.push_back( part );
+        }
+
+        if( comma == wxString::npos )
+            break;
+        start = comma + 1;
+    }
+
+    if( expanded.empty() )
+    {
+        expanded.push_back( aPinName );
+        if( aValid )
+            *aValid = false;
+    }
+
+    return expanded;
+}

cvpcb/cvpcb_mainframe.cpp

@@ -62,6 +62,7 @@
 #include <wx/stattext.h>
 #include <wx/button.h>
 #include <wx/msgdlg.h>
+#include <wx/ffile.h>
 
 
 CVPCB_MAINFRAME::CVPCB_MAINFRAME( KIWAY* aKiway, wxWindow* aParent ) :
@@ -796,7 +797,12 @@ void CVPCB_MAINFRAME::DisplayStatus()
         msg.Empty();
 
         if( symbol )
-            msg = wxString::Format( wxT( "%i" ), symbol->GetPinCount() );
+        {
+            int pc = symbol->GetPinCount();
+            wxLogTrace( "CVPCB_PINCOUNT", wxT( "DisplayStatus: selected '%s' pinCount=%d" ),
+                        symbol->GetReference(), pc );
+            msg = wxString::Format( wxT( "%i" ), pc );
+        }
 
         if( !filters.IsEmpty() )
             filters += wxT( ", " );
@@ -957,6 +963,12 @@ int CVPCB_MAINFRAME::readSchematicNetlist( const std::string& aNetlist )
 
     m_netlist.Clear();
 
+    // Trace basic payload characteristics to verify libparts are present and visible here
+    wxLogTrace( "CVPCB_PINCOUNT",
+                wxT( "readSchematicNetlist: payload size=%zu has_libparts=%d has_libpart=%d" ),
+                aNetlist.size(), aNetlist.find( "(libparts" ) != std::string::npos,
+                aNetlist.find( "(libpart" ) != std::string::npos );
+
     try
     {
         netlistReader.LoadNetlist();

cvpcb/footprints_listbox.cpp

@@ -132,7 +132,13 @@ void FOOTPRINTS_LISTBOX::SetFootprints( FOOTPRINT_LIST& aList, const wxString& a
         filter.FilterByFootprintFilters( aComponent->GetFootprintFilters() );
 
     if( aFilterType & FILTERING_BY_PIN_COUNT && aComponent )
-        filter.FilterByPinCount( aComponent->GetPinCount() );
+    {
+        int pc = aComponent->GetPinCount();
+        wxLogTrace( "CVPCB_PINCOUNT",
+                    wxT( "FOOTPRINTS_LISTBOX::SetFootprints: ref='%s' pinCount filter=%d" ),
+                    aComponent->GetReference(), pc );
+        filter.FilterByPinCount( pc );
+    }
 
     if( aFilterType & FILTERING_BY_LIBRARY )
         filter.FilterByLibrary( aLibName );

eeschema/dialogs/dialog_field_properties.cpp

@@ -175,11 +175,28 @@ DIALOG_FIELD_PROPERTIES::DIALOG_FIELD_PROPERTIES( SCH_BASE_FRAME* aParent, const
         wxString      netlist;
         wxArrayString pins;
 
-        for( SCH_PIN* pin : symbol->GetPins( 0 /* all units */, 1 /* single bodyStyle */ ) )
+        for( SCH_PIN* pin : symbol->GetGraphicalPins( 0 /* all units */, 1 /* single bodyStyle */ ) )
+        {
+            bool valid = false;
+            auto expanded = pin->GetStackedPinNumbers( &valid );
+
+            if( valid && !expanded.empty() )
+            {
+                for( const wxString& num : expanded )
+                    pins.push_back( num + ' ' + pin->GetShownName() );
+            }
+            else
+            {
                 pins.push_back( pin->GetNumber() + ' ' + pin->GetShownName() );
+            }
+        }
 
         if( !pins.IsEmpty() )
-            netlist << EscapeString( wxJoin( pins, '\t' ), CTX_LINE );
+        {
+            wxString dbg = wxJoin( pins, '\t' );
+            wxLogTrace( "FOOTPRINT_CHOOSER", wxS( "Chooser payload pins (LIB_SYMBOL): %s" ), dbg );
+            netlist << EscapeString( dbg, CTX_LINE );
+        }
 
         netlist << wxS( "\r" );
 
@@ -213,12 +230,28 @@ DIALOG_FIELD_PROPERTIES::DIALOG_FIELD_PROPERTIES( SCH_BASE_FRAME* aParent, const
 
         if( lib_symbol )
         {
-            for( SCH_PIN* pin : lib_symbol->GetPins( 0 /* all units */, 1 /* single bodyStyle */ ) )
+            for( SCH_PIN* pin : lib_symbol->GetGraphicalPins( 0 /* all units */, 1 /* single bodyStyle */ ) )
+            {
+                bool valid = false;
+                auto expanded = pin->GetStackedPinNumbers( &valid );
+                if( valid && !expanded.empty() )
+                {
+                    for( const wxString& num : expanded )
+                        pins.push_back( num + ' ' + pin->GetShownName() );
+                }
+                else
+                {
                     pins.push_back( pin->GetNumber() + ' ' + pin->GetShownName() );
                 }
+            }
+        }
 
         if( !pins.IsEmpty() )
-            netlist << EscapeString( wxJoin( pins, '\t' ), CTX_LINE );
+        {
+            wxString dbg = wxJoin( pins, '\t' );
+            wxLogTrace( "FOOTPRINT_CHOOSER", wxS( "Chooser payload pins (SCH_SYMBOL): %s" ), dbg );
+            netlist << EscapeString( dbg, CTX_LINE );
+        }
 
         netlist << wxS( "\r" );
 

eeschema/dialogs/dialog_lib_fields_table.cpp

@@ -402,7 +402,7 @@ void DIALOG_LIB_FIELDS_TABLE::SetupColumnProperties( int aCol )
             LIB_SYMBOL* symbol = m_symbolsList[0];
             wxArrayString pins;
 
-            for( SCH_PIN* pin : symbol->GetPins( 0 /* all units */, 1 /* single bodyStyle */ ) )
+            for( SCH_PIN* pin : symbol->GetGraphicalPins( 0 /* all units */, 1 /* single bodyStyle */ ) )
                 pins.push_back( pin->GetNumber() + ' ' + pin->GetShownName() );
 
             if( !pins.IsEmpty() )

eeschema/erc/erc.cpp

@@ -631,7 +631,7 @@ int ERC_TESTER::TestMissingUnits()
                 }
             }
 
-            for( SCH_PIN* pin : libSymbol->GetPins( missing_unit, bodyStyle ) )
+            for( SCH_PIN* pin : libSymbol->GetGraphicalPins( missing_unit, bodyStyle ) )
             {
                 switch( pin->GetType() )
                 {
@@ -1295,6 +1295,44 @@ int ERC_TESTER::TestGroundPins()
 }
 
 
+int ERC_TESTER::TestStackedPinNotation()
+{
+    int warnings = 0;
+
+    for( const SCH_SHEET_PATH& sheet : m_sheetList )
+    {
+        SCH_SCREEN* screen = sheet.LastScreen();
+
+        for( SCH_ITEM* item : screen->Items().OfType( SCH_SYMBOL_T ) )
+        {
+            SCH_SYMBOL* symbol = static_cast<SCH_SYMBOL*>( item );
+
+            for( SCH_PIN* pin : symbol->GetPins( &sheet ) )
+            {
+                bool valid;
+                pin->GetStackedPinNumbers( &valid );
+
+                if( !valid )
+                {
+                    std::shared_ptr<ERC_ITEM> ercItem =
+                            ERC_ITEM::Create( ERCE_STACKED_PIN_SYNTAX );
+                    ercItem->SetItems( pin );
+                    ercItem->SetSheetSpecificPath( sheet );
+                    ercItem->SetItemsSheetPaths( sheet );
+
+                    SCH_MARKER* marker =
+                            new SCH_MARKER( std::move( ercItem ), pin->GetPosition() );
+                    screen->Append( marker );
+                    warnings++;
+                }
+            }
+        }
+    }
+
+    return warnings;
+}
+
+
 int ERC_TESTER::TestSameLocalGlobalLabel()
 {
     int errCount = 0;
@@ -1961,6 +1999,9 @@ void ERC_TESTER::RunTests( DS_PROXY_VIEW_ITEM* aDrawingSheet, SCH_EDIT_FRAME* aE
     if( m_settings.IsTestEnabled( ERCE_GROUND_PIN_NOT_GROUND ) )
         TestGroundPins();
 
+    if( m_settings.IsTestEnabled( ERCE_STACKED_PIN_SYNTAX ) )
+        TestStackedPinNotation();
+
     // Test similar labels (i;e. labels which are identical when
     // using case insensitive comparisons)
     if( m_settings.IsTestEnabled( ERCE_SIMILAR_LABELS )

eeschema/erc/erc.h

@@ -118,6 +118,12 @@ public:
      */
     int TestGroundPins();
 
+    /**
+     * Checks for pin numbers that resemble stacked pin notation but are invalid.
+     * @return warning count
+     */
+    int TestStackedPinNotation();
+
     /**
      * Checks for global and local labels with the same name
      * @return the error count

eeschema/erc/erc_item.cpp

@@ -161,6 +161,10 @@ ERC_ITEM ERC_ITEM::groundPinNotGround( ERCE_GROUND_PIN_NOT_GROUND,
         _HKI( "Ground pin not connected to ground net" ),
         wxT( "ground_pin_not_ground" ) );
 
+ERC_ITEM ERC_ITEM::stackedPinName( ERCE_STACKED_PIN_SYNTAX,
+        _HKI( "Pin name resembles stacked pin" ),
+        wxT( "stacked_pin_name" ) );
+
 ERC_ITEM ERC_ITEM::unresolvedVariable( ERCE_UNRESOLVED_VARIABLE,
         _HKI( "Unresolved text variable" ),
         wxT( "unresolved_variable" ) );
@@ -268,6 +272,7 @@ std::vector<std::reference_wrapper<RC_ITEM>> ERC_ITEM::allItemTypes(
             ERC_ITEM::groundPinNotGround,
 
             ERC_ITEM::heading_misc,
+            ERC_ITEM::stackedPinName,
             ERC_ITEM::unannotated,
             ERC_ITEM::unresolvedVariable,
             ERC_ITEM::undefinedNetclass,
@@ -351,6 +356,7 @@ std::shared_ptr<ERC_ITEM> ERC_ITEM::Create( int aErrorCode )
     case ERCE_MISSING_POWER_INPUT_PIN: return std::make_shared<ERC_ITEM>( missingPowerInputPin );
     case ERCE_MISSING_BIDI_PIN:        return std::make_shared<ERC_ITEM>( missingBidiPin );
     case ERCE_UNCONNECTED_WIRE_ENDPOINT: return std::make_shared<ERC_ITEM>( unconnectedWireEndpoint );
+    case ERCE_STACKED_PIN_SYNTAX:      return std::make_shared<ERC_ITEM>( stackedPinName );
     case ERCE_UNSPECIFIED:
     default:
         wxFAIL_MSG( wxS( "Unknown ERC error code" ) );

eeschema/erc/erc_item.h

@@ -227,6 +227,7 @@ private:
     static ERC_ITEM busToBusConflict;
     static ERC_ITEM busToNetConflict;
     static ERC_ITEM groundPinNotGround;
+    static ERC_ITEM stackedPinName;
     static ERC_ITEM unresolvedVariable;
     static ERC_ITEM undefinedNetclass;
     static ERC_ITEM simulationModelIssues;

eeschema/erc/erc_settings.cpp

@@ -120,6 +120,7 @@ ERC_SETTINGS::ERC_SETTINGS( JSON_SETTINGS* aParent, const std::string& aPath ) :
     m_ERCSeverities[ERCE_FOUR_WAY_JUNCTION]       = RPT_SEVERITY_IGNORE;
     m_ERCSeverities[ERCE_LABEL_MULTIPLE_WIRES]    = RPT_SEVERITY_WARNING;
     m_ERCSeverities[ERCE_UNCONNECTED_WIRE_ENDPOINT] = RPT_SEVERITY_WARNING;
+    m_ERCSeverities[ERCE_STACKED_PIN_SYNTAX]      = RPT_SEVERITY_WARNING;
 
     m_params.emplace_back( new PARAM_LAMBDA<nlohmann::json>( "rule_severities",
             [&]() -> nlohmann::json

eeschema/erc/erc_settings.h

@@ -87,8 +87,9 @@ enum ERCE_T
     ERCE_FOUR_WAY_JUNCTION,       ///< A four-way junction was found.
     ERCE_LABEL_MULTIPLE_WIRES,    ///< A label is connected to more than one wire.
     ERCE_UNCONNECTED_WIRE_ENDPOINT, ///< A label is connected to more than one wire.
+    ERCE_STACKED_PIN_SYNTAX,      ///< Pin name resembles stacked pin notation.
 
-    ERCE_LAST = ERCE_UNCONNECTED_WIRE_ENDPOINT,
+    ERCE_LAST = ERCE_STACKED_PIN_SYNTAX,
 
     ERCE_DUPLICATE_PIN_ERROR,
     ERCE_PIN_TO_PIN_WARNING,    // pin connected to an other pin: warning level

eeschema/fields_grid_table.cpp

@@ -79,12 +79,29 @@ static wxString netList( SCH_SYMBOL* aSymbol, SCH_SHEET_PATH& aSheetPath )
 
     if( lib_symbol )
     {
-        for( SCH_PIN* pin : lib_symbol->GetPins( 0 /* all units */, 1 /* single bodyStyle */ ) )
+        for( SCH_PIN* pin : lib_symbol->GetGraphicalPins( 0 /* all units */, 1 /* single bodyStyle */ ) )
+        {
+            bool                  valid = false;
+            std::vector<wxString> expanded = pin->GetStackedPinNumbers( &valid );
+
+            if( valid && !expanded.empty() )
+            {
+                for( const wxString& num : expanded )
+                    pins.push_back( num + ' ' + pin->GetShownName() );
+            }
+            else
+            {
                 pins.push_back( pin->GetNumber() + ' ' + pin->GetShownName() );
             }
+        }
+    }
 
     if( !pins.IsEmpty() )
-        netlist << EscapeString( wxJoin( pins, '\t' ), CTX_LINE );
+    {
+        wxString dbg = wxJoin( pins, '\t' );
+        wxLogTrace( "FOOTPRINT_CHOOSER", wxS( "Chooser payload pins: %s" ), dbg );
+        netlist << EscapeString( dbg, CTX_LINE );
+    }
 
     netlist << wxS( "\r" );
 
@@ -112,11 +129,28 @@ static wxString netList( LIB_SYMBOL* aSymbol )
     wxString      netlist;
     wxArrayString pins;
 
-    for( SCH_PIN* pin : aSymbol->GetPins( 0 /* all units */, 1 /* single bodyStyle */ ) )
+    for( SCH_PIN* pin : aSymbol->GetGraphicalPins( 0 /* all units */, 1 /* single bodyStyle */ ) )
+    {
+        bool valid = false;
+        std::vector<wxString> expanded = pin->GetStackedPinNumbers( &valid );
+
+        if( valid && !expanded.empty() )
+        {
+            for( const wxString& num : expanded )
+                pins.push_back( num + ' ' + pin->GetShownName() );
+        }
+        else
+        {
             pins.push_back( pin->GetNumber() + ' ' + pin->GetShownName() );
+        }
+    }
 
     if( !pins.IsEmpty() )
-        netlist << EscapeString( wxJoin( pins, '\t' ), CTX_LINE );
+    {
+        wxString dbg = wxJoin( pins, '\t' );
+        wxLogTrace( "FOOTPRINT_CHOOSER", wxS( "Chooser payload pins: %s" ), dbg );
+        netlist << EscapeString( dbg, CTX_LINE );
+    }
 
     netlist << wxS( "\r" );
 

eeschema/lib_symbol.cpp

@@ -782,7 +782,7 @@ void LIB_SYMBOL::AddDrawItem( SCH_ITEM* aItem, bool aSort )
 }
 
 
-std::vector<SCH_PIN*> LIB_SYMBOL::GetPins( int aUnit, int aBodyStyle ) const
+std::vector<SCH_PIN*> LIB_SYMBOL::GetGraphicalPins( int aUnit, int aBodyStyle ) const
 {
     std::vector<SCH_PIN*> pins;
 
@@ -807,28 +807,75 @@ std::vector<SCH_PIN*> LIB_SYMBOL::GetPins( int aUnit, int aBodyStyle ) const
             continue;
 
         // TODO: get rid of const_cast.  (It used to be a C-style cast so was less noticeable.)
-        pins.push_back( const_cast<SCH_PIN*>( static_cast<const SCH_PIN*>( &item ) ) );
+        SCH_PIN* pin = const_cast<SCH_PIN*>( static_cast<const SCH_PIN*>( &item ) );
+        wxLogTrace( "KICAD_STACKED_PINS",
+                    wxString::Format( "GetGraphicalPins: lib='%s' unit=%d body=%d -> include pin name='%s' number='%s' shownNum='%s'",
+                                      GetLibId().Format().wx_str(), aUnit, aBodyStyle,
+                                      pin->GetName(), pin->GetNumber(), pin->GetShownNumber() ) );
+        pins.push_back( pin );
     }
 
     return pins;
 }
 
 
-std::vector<SCH_PIN*> LIB_SYMBOL::GetPins() const
+std::vector<LIB_SYMBOL::LOGICAL_PIN> LIB_SYMBOL::GetLogicalPins( int aUnit, int aBodyStyle ) const
 {
-    return GetPins( 0, 0 );
+    std::vector<LOGICAL_PIN> out;
+
+    for( SCH_PIN* pin : GetGraphicalPins( aUnit, aBodyStyle ) )
+    {
+        bool valid = false;
+        std::vector<wxString> expanded = pin->GetStackedPinNumbers( &valid );
+
+        if( valid && !expanded.empty() )
+        {
+            for( const wxString& num : expanded )
+            {
+                out.push_back( LOGICAL_PIN{ pin, num } );
+                wxLogTrace( "KICAD_STACKED_PINS",
+                            wxString::Format( "GetLogicalPins: base='%s' -> '%s'",
+                                              pin->GetShownNumber(), num ) );
+            }
+        }
+        else
+        {
+            out.push_back( LOGICAL_PIN{ pin, pin->GetShownNumber() } );
+            wxLogTrace( "KICAD_STACKED_PINS",
+                        wxString::Format( "GetLogicalPins: base='%s' (no expansion)",
+                                          pin->GetShownNumber() ) );
+        }
+    }
+
+    return out;
 }
 
 
 int LIB_SYMBOL::GetPinCount()
 {
-    return (int) GetPins( 0 /* all units */, 1 /* single body style */ ).size();
+    int count = 0;
+
+    for( SCH_PIN* pin : GetGraphicalPins( 0 /* all units */, 1 /* single body style */ ) )
+    {
+        bool                        valid;
+        std::vector<wxString> numbers = pin->GetStackedPinNumbers( &valid );
+    wxLogTrace( "CVPCB_PINCOUNT",
+            wxString::Format( "LIB_SYMBOL::GetPinCount lib='%s' pin base='%s' shown='%s' valid=%d +%zu",
+                      GetLibId().Format().wx_str(), pin->GetName(),
+                      pin->GetShownNumber(), valid, numbers.size() ) );
+        count += numbers.size();
+    }
+
+    wxLogTrace( "CVPCB_PINCOUNT",
+        wxString::Format( "LIB_SYMBOL::GetPinCount total for lib='%s' => %d",
+                  GetLibId().Format().wx_str(), count ) );
+    return count;
 }
 
 
 SCH_PIN* LIB_SYMBOL::GetPin( const wxString& aNumber, int aUnit, int aBodyStyle ) const
 {
-    for( SCH_PIN* pin : GetPins( aUnit, aBodyStyle ) )
+    for( SCH_PIN* pin : GetGraphicalPins( aUnit, aBodyStyle ) )
     {
         if( aNumber == pin->GetNumber() )
             return pin;
@@ -841,12 +888,12 @@ SCH_PIN* LIB_SYMBOL::GetPin( const wxString& aNumber, int aUnit, int aBodyStyle
 bool LIB_SYMBOL::PinsConflictWith( const LIB_SYMBOL& aOtherPart, bool aTestNums, bool aTestNames,
                                    bool aTestType, bool aTestOrientation, bool aTestLength ) const
 {
-    for( const SCH_PIN* pin : GetPins() )
+    for( const SCH_PIN* pin : GetGraphicalPins() )
     {
         wxASSERT( pin );
         bool foundMatch = false;
 
-        for( const SCH_PIN* otherPin : aOtherPart.GetPins() )
+        for( const SCH_PIN* otherPin : aOtherPart.GetGraphicalPins() )
         {
             wxASSERT( otherPin );
 
@@ -899,6 +946,12 @@ bool LIB_SYMBOL::PinsConflictWith( const LIB_SYMBOL& aOtherPart, bool aTestNums,
     return false;
 }
 
+std::vector<SCH_PIN*> LIB_SYMBOL::GetPins() const
+{
+    // Back-compat shim: return graphical pins for all units/body styles
+    return GetGraphicalPins( 0, 0 );
+}
+
 
 const BOX2I LIB_SYMBOL::GetUnitBoundingBox( int aUnit, int aBodyStyle,
                                             bool aIgnoreHiddenFields,

eeschema/lib_symbol.h

@@ -416,21 +416,32 @@ public:
     void RemoveField( SCH_FIELD* aField ) { RemoveDrawItem( aField ); }
 
     /**
-     * Return a list of pin object pointers from the draw item list.
+     * Graphical pins: Return schematic pin objects as drawn (unexpanded), filtered by unit/body.
      *
-     * Note pin objects are owned by the draw list of the symbol.  Deleting any of the objects
-     * will leave list in a unstable state and will likely segfault when the list is destroyed.
+     * Note: pin objects are owned by the symbol's draw list; do not delete them.
      *
-     * @param aUnit - Unit number of pins to collect.  Set to 0 to get pins from all symbol units.
-     * @param aBodyStyle - Symbol alternate body style of pins to collect.  Set to 0 to get pins
-     *                     from all body styles.
+     * @param aUnit Unit number to collect; 0 = all units
+     * @param aBodyStyle Alternate body style to collect; 0 = all body styles
      */
-    std::vector<SCH_PIN*> GetPins( int aUnit, int aBodyStyle ) const;
+    std::vector<SCH_PIN*> GetGraphicalPins( int aUnit = 0, int aBodyStyle = 0 ) const;
 
     /**
-     * Return a list of pin pointers for all units / converts.  Used primarily for SPICE where
-     * we want to treat all unit as a single part.
+     * Logical pins: Return expanded logical pins based on stacked-pin notation.
+     * Each returned item pairs a base graphical pin with a single expanded logical number.
      */
+    struct LOGICAL_PIN
+    {
+        SCH_PIN*   pin;        ///< pointer to the base graphical pin
+        wxString   number;     ///< expanded logical pin number
+    };
+
+    /**
+     * Return all logical pins (expanded) filtered by unit/body.
+     * For non-stacked pins, the single logical pin's number equals the base pin number.
+     */
+    std::vector<LOGICAL_PIN> GetLogicalPins( int aUnit, int aBodyStyle ) const;
+
+    // Deprecated: use GetGraphicalPins(). This override remains to satisfy SYMBOL's pure virtual.
     std::vector<SCH_PIN*> GetPins() const override;
 
     /**

eeschema/multiline_pin_text.cpp

@@ -0,0 +1,67 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright The KiCad Developers
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 3
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one at
+ * http://www.gnu.org/licenses/
+ */
+
+
+#include "multiline_pin_text.h"
+
+#include <wx/tokenzr.h>
+
+MULTILINE_PIN_TEXT_LAYOUT ComputeMultiLinePinNumberLayout( const wxString& aText,
+        const VECTOR2D& aAnchorPos, const TEXT_ATTRIBUTES& aAttrs )
+{
+    MULTILINE_PIN_TEXT_LAYOUT layout;
+    layout.m_StartPos = aAnchorPos;
+
+    if( !( aText.StartsWith( "[" ) && aText.EndsWith( "]" ) && aText.Contains( "\n" ) ) )
+        return layout; // not multi-line stacked
+
+    wxString content = aText.Mid( 1, aText.Length() - 2 );
+    wxArrayString lines; wxStringSplit( content, lines, '\n' );
+    if( lines.size() <= 1 )
+        return layout;
+
+    layout.m_IsMultiLine = true;
+
+    layout.m_Lines = lines;
+    for( size_t i = 0; i < layout.m_Lines.size(); ++i )
+        layout.m_Lines[i].Trim( true ).Trim( false );
+
+    layout.m_LineSpacing = KiROUND( aAttrs.m_Size.y * 1.3 );
+
+    // Apply alignment-dependent origin shift identical to sch_painter logic
+    if( aAttrs.m_Angle == ANGLE_VERTICAL )
+    {
+        int totalWidth = ( (int) layout.m_Lines.size() - 1 ) * layout.m_LineSpacing;
+        if( aAttrs.m_Halign == GR_TEXT_H_ALIGN_RIGHT )
+            layout.m_StartPos.x -= totalWidth;
+        else if( aAttrs.m_Halign == GR_TEXT_H_ALIGN_CENTER )
+            layout.m_StartPos.x -= totalWidth / 2;
+    }
+    else
+    {
+        int totalHeight = ( (int) layout.m_Lines.size() - 1 ) * layout.m_LineSpacing;
+        if( aAttrs.m_Valign == GR_TEXT_V_ALIGN_BOTTOM )
+            layout.m_StartPos.y -= totalHeight;
+        else if( aAttrs.m_Valign == GR_TEXT_V_ALIGN_CENTER )
+            layout.m_StartPos.y -= totalHeight / 2;
+    }
+
+    return layout;
+}

eeschema/multiline_pin_text.h

@@ -0,0 +1,40 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright The KiCad Developers
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 3
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one at
+ * http://www.gnu.org/licenses/
+ */
+
+
+#pragma once
+
+#include <wx/string.h>
+#include <wx/arrstr.h>
+#include <math/vector2d.h>
+#include <font/text_attributes.h>
+
+struct MULTILINE_PIN_TEXT_LAYOUT
+{
+    bool        m_IsMultiLine = false;     // true if brace-wrapped multi-line stacked list
+    wxArrayString m_Lines;                 // individual numbered lines (trimmed)
+    VECTOR2D    m_StartPos;                // position used for line index 0 after alignment shift
+    int         m_LineSpacing = 0;         // inter-line spacing in IU (along secondary axis)
+};
+
+// Compute layout for a (possibly) multi-line stacked pin number string.  If not multi-line, the
+// returned layout has m_IsMultiLine=false and no further adjustments are required.
+MULTILINE_PIN_TEXT_LAYOUT ComputeMultiLinePinNumberLayout( const wxString& aText,
+        const VECTOR2D& aAnchorPos, const TEXT_ATTRIBUTES& aAttrs );

eeschema/netlist_exporters/netlist_exporter_base.cpp

@@ -176,7 +176,21 @@ std::vector<PIN_INFO> NETLIST_EXPORTER_BASE::CreatePinList( SCH_SYMBOL* aSymbol,
                         continue;
                 }
 
-                pins.emplace_back( pin->GetShownNumber(), netName );
+                bool                  valid;
+                std::vector<wxString> numbers = pin->GetStackedPinNumbers( &valid );
+                wxString              baseName = pin->GetShownName();
+                wxLogTrace( "KICAD_STACKED_PINS",
+                            wxString::Format( "CreatePinList(single): ref='%s' pinNameBase='%s' shownNum='%s' net='%s' "
+                                              "valid=%d expand=%zu",
+                                              ref, baseName, pin->GetShownNumber(), netName, valid, numbers.size() ) );
+
+                for( const wxString& num : numbers )
+                {
+                    wxString pinName = baseName.IsEmpty() ? num : baseName + wxT( "_" ) + num;
+                    wxLogTrace( "KICAD_STACKED_PINS",
+                                wxString::Format( " -> emit pin num='%s' name='%s' net='%s'", num, pinName, netName ) );
+                    pins.emplace_back( num, netName, pinName );
+                }
             }
         }
     }
@@ -266,7 +280,20 @@ void NETLIST_EXPORTER_BASE::findAllUnitsOfSymbol( SCH_SYMBOL* aSchSymbol,
                             continue;
                     }
 
-                    aPins.emplace_back( pin->GetShownNumber(), netName );
+                    bool                        valid;
+                    std::vector<wxString> numbers = pin->GetStackedPinNumbers( &valid );
+                    wxString                     baseName = pin->GetShownName();
+                    wxLogTrace( "KICAD_STACKED_PINS",
+                               wxString::Format( "CreatePinList(multi): ref='%s' pinNameBase='%s' shownNum='%s' net='%s' valid=%d expand=%zu",
+                                                 ref2, baseName, pin->GetShownNumber(), netName, valid, numbers.size() ) );
+
+                    for( const wxString& num : numbers )
+                    {
+                        wxString pinName = baseName.IsEmpty() ? num : baseName + wxT( "_" ) + num;
+                        wxLogTrace( "KICAD_STACKED_PINS",
+                                    wxString::Format( " -> emit pin num='%s' name='%s' net='%s'", num, pinName, netName ) );
+                        aPins.emplace_back( num, netName, pinName );
+                    }
                 }
             }
         }

eeschema/netlist_exporters/netlist_exporter_base.h

@@ -71,13 +71,15 @@ struct LIB_SYMBOL_LESS_THAN
 
 struct PIN_INFO
 {
-    PIN_INFO( const wxString& aPinNumber, const wxString& aNetName ) :
+    PIN_INFO( const wxString& aPinNumber, const wxString& aNetName, const wxString& aPinName ) :
             num( aPinNumber ),
-            netName( aNetName )
+            netName( aNetName ),
+            pinName( aPinName )
     {}
 
     wxString num;
     wxString netName;
+    wxString pinName;
 };
 
 

eeschema/netlist_exporters/netlist_exporter_xml.cpp

@@ -495,7 +495,8 @@ XNODE* NETLIST_EXPORTER_XML::makeGroups()
     XNODE* xcomps = node( wxT( "groups" ) );
 
     m_referencesAlreadyFound.Clear();
-    m_libParts.clear();
+    // Do not clear m_libParts here: it is populated in makeSymbols() and used later by
+    // makeLibParts() to emit the libparts section for CvPcb and other consumers.
 
     SCH_SHEET_PATH currentSheet = m_schematic->CurrentSheet();
     SCH_SHEET_LIST sheetList = m_schematic->Hierarchy();
@@ -759,7 +760,9 @@ XNODE* NETLIST_EXPORTER_XML::makeLibParts()
         }
 
     //----- show the pins here ------------------------------------
-        std::vector<SCH_PIN*> pinList = lcomp->GetPins( 0, 0 );
+    // NOTE: Expand stacked-pin notation into individual pins so downstream
+    // tools (e.g. CvPcb) see the actual number of footprint pins.
+    std::vector<SCH_PIN*> pinList = lcomp->GetGraphicalPins( 0, 0 );
 
         /*
          * We must erase redundant Pins references in pinList
@@ -780,6 +783,10 @@ XNODE* NETLIST_EXPORTER_XML::makeLibParts()
             }
         }
 
+        wxLogTrace( "CVPCB_PINCOUNT",
+                wxString::Format( "makeLibParts: lib='%s' part='%s' pinList(size)=%zu",
+                          libNickname, lcomp->GetName(), pinList.size() ) );
+
         if( pinList.size() )
         {
             XNODE*     pins;
@@ -788,12 +795,40 @@ XNODE* NETLIST_EXPORTER_XML::makeLibParts()
 
             for( unsigned i=0; i<pinList.size();  ++i )
             {
-                XNODE*     pin;
+                SCH_PIN* basePin = pinList[i];
 
+                bool                     stackedValid = false;
+                std::vector<wxString>    expandedNums = basePin->GetStackedPinNumbers( &stackedValid );
+
+                // If stacked notation detected and valid, emit one libparts pin per expanded number.
+                if( stackedValid && !expandedNums.empty() )
+                {
+                    for( const wxString& num : expandedNums )
+                    {
+                        XNODE* pin;
                         pins->AddChild( pin = node( wxT( "pin" ) ) );
-                pin->AddAttribute( wxT( "num" ), pinList[i]->GetShownNumber() );
-                pin->AddAttribute( wxT( "name" ), pinList[i]->GetShownName() );
-                pin->AddAttribute( wxT( "type" ), pinList[i]->GetCanonicalElectricalTypeName() );
+                        pin->AddAttribute( wxT( "num" ), num );
+                        pin->AddAttribute( wxT( "name" ), basePin->GetShownName() );
+                        pin->AddAttribute( wxT( "type" ), basePin->GetCanonicalElectricalTypeName() );
+
+                        wxLogTrace( "CVPCB_PINCOUNT",
+                                    wxString::Format( "makeLibParts: -> pin num='%s' name='%s' (expanded)",
+                                                      num, basePin->GetShownName() ) );
+                    }
+                }
+                else
+                {
+                    XNODE* pin;
+                    pins->AddChild( pin = node( wxT( "pin" ) ) );
+                    pin->AddAttribute( wxT( "num" ), basePin->GetShownNumber() );
+                    pin->AddAttribute( wxT( "name" ), basePin->GetShownName() );
+                    pin->AddAttribute( wxT( "type" ), basePin->GetCanonicalElectricalTypeName() );
+
+                    wxLogTrace( "CVPCB_PINCOUNT",
+                                wxString::Format( "makeLibParts: -> pin num='%s' name='%s'",
+                                                  basePin->GetShownNumber(),
+                                                  basePin->GetShownName() ) );
+                }
 
                 // caution: construction work site here, drive slowly
             }
@@ -956,7 +991,6 @@ XNODE* NETLIST_EXPORTER_XML::makeListOfNets( unsigned aCtl )
     for( const NET_NODE& netNode : net_record->m_Nodes )
         {
             wxString refText = netNode.m_Pin->GetParentSymbol()->GetRef( &netNode.m_Sheet );
-            wxString pinText = netNode.m_Pin->GetShownNumber();
 
             // Skip power symbols and virtual symbols
             if( refText[0] == wxChar( '#' ) )
@@ -974,21 +1008,39 @@ XNODE* NETLIST_EXPORTER_XML::makeListOfNets( unsigned aCtl )
                 added = true;
             }
 
-            xnet->AddChild( xnode = node( wxT( "node" ) ) );
-            xnode->AddAttribute( wxT( "ref" ), refText );
-            xnode->AddAttribute( wxT( "pin" ), pinText );
-
-            wxString pinName = netNode.m_Pin->GetShownName();
+            std::vector<wxString> nums = netNode.m_Pin->GetStackedPinNumbers();
+            wxString              baseName = netNode.m_Pin->GetShownName();
             wxString              pinType = netNode.m_Pin->GetCanonicalElectricalTypeName();
 
-            if( !pinName.IsEmpty() )
-                xnode->AddAttribute( wxT( "pinfunction" ), pinName );
+            wxLogTrace( "KICAD_STACKED_PINS",
+                        wxString::Format( "XML: net='%s' ref='%s' base='%s' shownNum='%s' expand=%zu",
+                                          net_record->m_Name, refText, baseName,
+                                          netNode.m_Pin->GetShownNumber(), nums.size() ) );
+
+            for( const wxString& num : nums )
+            {
+                xnet->AddChild( xnode = node( wxT( "node" ) ) );
+                xnode->AddAttribute( wxT( "ref" ), refText );
+                xnode->AddAttribute( wxT( "pin" ), num );
+
+                wxString fullName = baseName.IsEmpty() ? num : baseName + wxT( "_" ) + num;
+
+                if( !baseName.IsEmpty() || nums.size() > 1 )
+                    xnode->AddAttribute( wxT( "pinfunction" ), fullName );
+
+                wxString typeAttr = pinType;
 
                 if( net_record->m_HasNoConnect
                     && ( net_record->m_Nodes.size() == 1 || allNetPinsStacked ) )
-                pinType += wxT( "+no_connect" );
+                {
+                    typeAttr += wxT( "+no_connect" );
+                    wxLogTrace( "KICAD_STACKED_PINS",
+                                wxString::Format( "XML: marking node ref='%s' pin='%s' as no_connect",
+                                                  refText, num ) );
+                }
 
-            xnode->AddAttribute( wxT( "pintype" ), pinType );
+                xnode->AddAttribute( wxT( "pintype" ), typeAttr );
+            }
         }
     }
 

eeschema/pin_layout_cache.cpp

@@ -1,11 +1,11 @@
 /*
  * This program source code file is part of KiCad, a free EDA CAD application.
  *
- * Copyright The KiCad Developers, see AUTHORS.txt for contributors.
+ * Copyright The KiCad Developers
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
+ * as published by the Free Software Foundation; either version 3
  * of the License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
@@ -14,60 +14,149 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program; if not, you may find one here:
- * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
- * or you may search the http://www.gnu.org website for the version 2 license,
- * or you may write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ * along with this program; if not, you may find one at
+ * http://www.gnu.org/licenses/
  */
 
 #include "pin_layout_cache.h"
-
 #include <geometry/direction45.h>
 #include <pgm_base.h>
 #include <settings/settings_manager.h>
 #include <sch_symbol.h>
 #include <eeschema_settings.h>
 #include <schematic_settings.h>
-
+#include <string_utils.h>
 #include <geometry/shape_utils.h>
 
+// Small margin in internal units between the pin text and the pin line
+static const int PIN_TEXT_MARGIN = 4;
 
-namespace
+// Forward declaration for helper implemented in sch_pin.cpp
+wxString FormatStackedPinForDisplay( const wxString& aPinNumber, int aPinLength, int aTextSize,
+                                     KIFONT::FONT* aFont, const KIFONT::METRICS& aFontMetrics );
+
+std::optional<PIN_LAYOUT_CACHE::TEXT_INFO> PIN_LAYOUT_CACHE::GetPinNumberInfo( int aShadowWidth )
 {
+    recomputeCaches();
 
-// small margin in internal units between the pin text and the pin line
-const int PIN_TEXT_MARGIN = 4;
+    wxString number = m_pin.GetShownNumber();
+    if( number.IsEmpty() || !m_pin.GetParentSymbol()->GetShowPinNumbers() )
+        return std::nullopt;
 
-struct EXTENTS_CACHE
-{
-    KIFONT::FONT* m_Font = nullptr;
-    int           m_FontSize = 0;
-    VECTOR2I      m_Extents;
-};
+    // Format stacked representation if necessary
+    EESCHEMA_SETTINGS*     cfg = GetAppSettings<EESCHEMA_SETTINGS>( "eeschema" );
+    KIFONT::FONT*          font = KIFONT::FONT::GetFont( cfg ? cfg->m_Appearance.default_font : wxString( "" ) );
+    const KIFONT::METRICS& metrics = m_pin.GetFontMetrics();
+    wxString formatted = FormatStackedPinForDisplay( number, m_pin.GetLength(), m_pin.GetNumberTextSize(), font, metrics );
 
-/// Utility for getting the size of the 'external' pin decorators (as a radius)
-// i.e. the negation circle, the polarity 'slopes' and the nonlogic
-// marker
-int externalPinDecoSize( const SCHEMATIC_SETTINGS* aSettings, const SCH_PIN& aPin )
+    std::optional<TEXT_INFO> info = TEXT_INFO();
+    info->m_Text      = formatted;
+    info->m_TextSize  = m_pin.GetNumberTextSize();
+    info->m_Thickness = m_numberThickness;
+    info->m_HAlign    = GR_TEXT_H_ALIGN_CENTER;
+    info->m_VAlign    = GR_TEXT_V_ALIGN_CENTER;
+
+    PIN_ORIENTATION orient = m_pin.PinDrawOrient( DefaultTransform );
+
+    auto estimateQABox = [&]( const wxString& txt, int size, bool isVertical ) -> VECTOR2I
+    {
+        int h = size;
+        int w = (int) ( txt.Length() * size * 0.6 );
+        if( txt.Contains( '\n' ) )
+        {
+            wxArrayString lines; wxStringSplit( txt, lines, '\n' );
+            if( isVertical )
+            {
+                int lineSpacing = KiROUND( size * 1.3 );
+                w = (int) lines.size() * lineSpacing;
+                size_t maxLen = 0; for( const wxString& l : lines ) maxLen = std::max( maxLen, l.Length() );
+                h = (int) ( maxLen * size * 0.6 );
+            }
+            else
+            {
+                int lineSpacing = KiROUND( size * 1.3 );
+                h = (int) lines.size() * lineSpacing;
+                size_t maxLen = 0; for( const wxString& l : lines ) maxLen = std::max( maxLen, l.Length() );
+                w = (int) ( maxLen * size * 0.6 );
+            }
+        }
+        return VECTOR2I( w, h );
+    };
+
+    // Pass 1: determine maximum perpendicular half span among all pin numbers to ensure
+    // a single distance from the pin center that avoids overlap for every pin.
+    const SYMBOL* parentSym = m_pin.GetParentSymbol();
+    int maxHalfHeight = 0; // vertical half span across all numbers
+    int maxHalfWidth  = 0; // horizontal half span across all numbers (for vertical pins overlap avoidance)
+    int maxFullHeight = 0; // full height (for dynamic clearance)
+    if( parentSym )
+    {
+        for( const SCH_PIN* p : parentSym->GetPins() )
+        {
+            wxString raw = p->GetShownNumber();
+            if( raw.IsEmpty() )
+                continue;
+            wxString fmt = FormatStackedPinForDisplay( raw, p->GetLength(), p->GetNumberTextSize(), font, p->GetFontMetrics() );
+            // Determine true max height regardless of rotation: use isVertical=false path for multiline height
+            VECTOR2I box = estimateQABox( fmt, p->GetNumberTextSize(), false );
+        maxHalfHeight = std::max( maxHalfHeight, box.y / 2 );
+        maxFullHeight = std::max( maxFullHeight, box.y );
+            maxHalfWidth  = std::max( maxHalfWidth,  box.x / 2 );
+        }
+    }
+    int clearance = getPinTextOffset() + schIUScale.MilsToIU( PIN_TEXT_MARGIN );
+    VECTOR2I pinPos = m_pin.GetPosition();
+    bool verticalOrient = ( orient == PIN_ORIENTATION::PIN_UP || orient == PIN_ORIENTATION::PIN_DOWN );
+
+    // We need the per-pin bounding width for vertical placement (rotated text).  For vertical
+    // pins we anchor by the RIGHT edge of the text box so the gap from the pin to text is
+    // constant (clearance) independent of text width (multi-line vs single-line).
+    auto currentBox = estimateQABox( formatted, info->m_TextSize, verticalOrient );
+
+    if( verticalOrient )
+    {
+        // Vertical pins: text is placed to the LEFT (negative X) and rotated vertical so that it
+        // reads bottom->top when the schematic is in its canonical orientation.  We right-edge
+        // align the text box at (pin.x - clearance) to keep a constant gap regardless of text width.
+        int boxWidth = currentBox.x;
+        int centerX = pinPos.x - clearance - boxWidth / 2;
+        info->m_TextPosition.x = centerX;
+        info->m_TextPosition.y = pinPos.y;
+        info->m_Angle = ANGLE_VERTICAL;
+    }
+    else
+    {
+        // Horizontal pins: "above" means negative Y direction.  All numbers are centered on the
+        // pin X and share a Y offset derived from the maximum half height across all numbers so
+        // that multi-line and single-line numbers align cleanly.
+        int centerY = pinPos.y - ( maxHalfHeight + clearance );
+        info->m_TextPosition.x = pinPos.x; // centered horizontally on pin origin
+        info->m_TextPosition.y = centerY;
+        info->m_Angle = ANGLE_HORIZONTAL;
+    }
+
+    return info;
+}
+// (Removed duplicate license & namespace with second PIN_TEXT_MARGIN to avoid ambiguity)
+
+// NOTE: The real implementation of FormatStackedPinForDisplay lives in sch_pin.cpp.
+// The accidental, partial duplicate that was here has been removed.
+
+// Reintroduce small helper functions (previously inside an anonymous namespace) needed later.
+static int externalPinDecoSize( const SCHEMATIC_SETTINGS* aSettings, const SCH_PIN& aPin )
 {
     if( aSettings && aSettings->m_PinSymbolSize )
         return aSettings->m_PinSymbolSize;
-
     return aPin.GetNumberTextSize() / 2;
 }
 
-
-int internalPinDecoSize( const SCHEMATIC_SETTINGS* aSettings, const SCH_PIN& aPin )
+static int internalPinDecoSize( const SCHEMATIC_SETTINGS* aSettings, const SCH_PIN& aPin )
 {
     if( aSettings && aSettings->m_PinSymbolSize > 0 )
         return aSettings->m_PinSymbolSize;
-
     return aPin.GetNameTextSize() != 0 ? aPin.GetNameTextSize() / 2 : aPin.GetNumberTextSize() / 2;
 }
 
-} // namespace
-
 
 PIN_LAYOUT_CACHE::PIN_LAYOUT_CACHE( const SCH_PIN& aPin ) :
         m_pin( aPin ), m_schSettings( nullptr ), m_dirtyFlags( DIRTY_FLAGS::ALL )
@@ -131,6 +220,42 @@ void PIN_LAYOUT_CACHE::recomputeExtentsCache( bool aDefinitelyDirty, KIFONT::FON
     VECTOR2D fontSize( aSize, aSize );
     int      penWidth = GetPenSizeForNormal( aSize );
 
+    // Handle multi-line text bounds properly
+    if( aText.StartsWith( "[" ) && aText.EndsWith( "]" ) && aText.Contains( "\n" ) )
+    {
+        // Extract content between braces and split into lines
+        wxString content = aText.Mid( 1, aText.Length() - 2 );
+        wxArrayString lines;
+        wxStringSplit( content, lines, '\n' );
+
+        if( lines.size() > 1 )
+        {
+            int lineSpacing = KiROUND( aSize * 1.3 );  // Same as drawMultiLineText
+            int maxWidth = 0;
+
+            // Find the widest line
+            for( const wxString& line : lines )
+            {
+                wxString trimmedLine = line;
+                trimmedLine.Trim( true ).Trim( false );
+                VECTOR2I lineExtents = aFont->StringBoundaryLimits( trimmedLine, fontSize, penWidth, false, false, aFontMetrics );
+                maxWidth = std::max( maxWidth, lineExtents.x );
+            }
+
+            // Calculate total dimensions - width is max line width, height accounts for all lines
+            int totalHeight = aSize + ( lines.size() - 1 ) * lineSpacing;
+
+            // Add space for braces
+            int braceWidth = aSize / 3;
+            maxWidth += braceWidth * 2;  // Space for braces on both sides
+            totalHeight += aSize / 3;    // Extra height for brace extensions
+
+            aCache.m_Extents = VECTOR2I( maxWidth, totalHeight );
+            return;
+        }
+    }
+
+    // Single line text (normal case)
     aCache.m_Extents = aFont->StringBoundaryLimits( aText, fontSize, penWidth, false, false, aFontMetrics );
 }
 
@@ -221,35 +346,38 @@ void PIN_LAYOUT_CACHE::transformBoxForPin( BOX2I& aBox ) const
 
 void PIN_LAYOUT_CACHE::transformTextForPin( TEXT_INFO& aInfo ) const
 {
-    // Now, calculate boundary box corners position for the actual pin orientation
+    // Local nominal position for a PIN_RIGHT orientation.
+    const VECTOR2I baseLocal = aInfo.m_TextPosition;
+
+    // We apply a rotation/mirroring depending on the pin orientation so that the text anchor
+    // maintains a constant perpendicular offset from the pin origin regardless of rotation.
+    VECTOR2I rotated = baseLocal;
+    EDA_ANGLE finalAngle = aInfo.m_Angle;
+
     switch( m_pin.PinDrawOrient( DefaultTransform ) )
     {
+    case PIN_ORIENTATION::PIN_RIGHT: // identity
+        break;
     case PIN_ORIENTATION::PIN_LEFT:
-    {
-        aInfo.m_HAlign = GetFlippedAlignment( aInfo.m_HAlign );
-        aInfo.m_TextPosition.x = -aInfo.m_TextPosition.x;
-        break;
-    }
-    case PIN_ORIENTATION::PIN_UP:
-    {
-        aInfo.m_Angle = ANGLE_VERTICAL;
-        aInfo.m_TextPosition = { aInfo.m_TextPosition.y, -aInfo.m_TextPosition.x };
-        break;
-    }
-    case PIN_ORIENTATION::PIN_DOWN:
-    {
-        aInfo.m_Angle = ANGLE_VERTICAL;
-        aInfo.m_TextPosition = { aInfo.m_TextPosition.y, aInfo.m_TextPosition.x };
+        rotated.x = -rotated.x;
+        rotated.y = -rotated.y;
+        aInfo.m_HAlign = GetFlippedAlignment( aInfo.m_HAlign );
+        break;
+    case PIN_ORIENTATION::PIN_UP: // rotate +90 (x,y)->(y,-x) and vertical text
+        rotated = { baseLocal.y, -baseLocal.x };
+        finalAngle = ANGLE_VERTICAL;
+        break;
+    case PIN_ORIENTATION::PIN_DOWN: // rotate -90 (x,y)->(-y,x) and vertical text, flip h-align
+        rotated = { -baseLocal.y, baseLocal.x };
+        finalAngle = ANGLE_VERTICAL;
         aInfo.m_HAlign = GetFlippedAlignment( aInfo.m_HAlign );
         break;
-    }
     default:
-    case PIN_ORIENTATION::PIN_RIGHT:
-        // Already in this form
         break;
     }
 
-    aInfo.m_TextPosition += m_pin.GetPosition();
+    aInfo.m_TextPosition = rotated + m_pin.GetPosition();
+    aInfo.m_Angle = finalAngle;
 }
 
 
@@ -643,50 +771,49 @@ std::optional<PIN_LAYOUT_CACHE::TEXT_INFO> PIN_LAYOUT_CACHE::GetPinNameInfo( int
         info->m_VAlign = GR_TEXT_V_ALIGN_BOTTOM;
     }
 
-    transformTextForPin( *info );
-    return info;
-}
-
-
-std::optional<PIN_LAYOUT_CACHE::TEXT_INFO> PIN_LAYOUT_CACHE::GetPinNumberInfo( int aShadowWidth )
-{
-    recomputeCaches();
-
-    wxString number = m_pin.GetShownNumber();
-    if( number.IsEmpty() || !m_pin.GetParentSymbol()->GetShowPinNumbers() )
-        return std::nullopt;
-
-    std::optional<TEXT_INFO> info;
-
-    info = TEXT_INFO();
-    info->m_Text = std::move( number );
-    info->m_TextSize = m_pin.GetNumberTextSize();
-    info->m_Thickness = m_numberThickness;
-    info->m_Angle = ANGLE_HORIZONTAL;
-    info->m_TextPosition = { m_pin.GetLength() / 2, 0 };
-    info->m_HAlign = GR_TEXT_H_ALIGN_CENTER;
-
-    // The pin number is above the pin if there's no name, or the name is inside
-    const bool numAbove =
-            m_pin.GetParentSymbol()->GetPinNameOffset() > 0
-            || ( m_pin.GetShownName().empty() || !m_pin.GetParentSymbol()->GetShowPinNames() );
-
-    if( numAbove )
+    // New policy: names follow same positioning semantics as numbers.
+    const SYMBOL* parentSym = m_pin.GetParentSymbol();
+    if( parentSym )
     {
-        info->m_TextPosition.y -= getPinTextOffset() + info->m_Thickness / 2;
-        info->m_VAlign = GR_TEXT_V_ALIGN_BOTTOM;
+        int maxHalfHeight = 0;
+        for( const SCH_PIN* p : parentSym->GetPins() )
+        {
+            wxString n = p->GetShownName();
+            if( n.IsEmpty() )
+                continue;
+            maxHalfHeight = std::max( maxHalfHeight, p->GetNameTextSize() / 2 );
+        }
+        int clearance = getPinTextOffset() + schIUScale.MilsToIU( PIN_TEXT_MARGIN );
+        VECTOR2I pinPos = m_pin.GetPosition();
+        PIN_ORIENTATION orient = m_pin.PinDrawOrient( DefaultTransform );
+        bool verticalOrient = ( orient == PIN_ORIENTATION::PIN_UP || orient == PIN_ORIENTATION::PIN_DOWN );
+
+        if( verticalOrient )
+        {
+            // Vertical pins: name mirrors number placement (left + rotated) for visual consistency.
+            int boxWidth = info->m_TextSize * (int) info->m_Text.Length() * 0.6; // heuristic width
+            int centerX = pinPos.x - clearance - boxWidth / 2;
+            info->m_TextPosition = { centerX, pinPos.y };
+            info->m_Angle = ANGLE_VERTICAL;
+            info->m_HAlign = GR_TEXT_H_ALIGN_CENTER;
+            info->m_VAlign = GR_TEXT_V_ALIGN_CENTER;
         }
         else
         {
-        info->m_TextPosition.y += getPinTextOffset() + info->m_Thickness / 2;
-        info->m_VAlign = GR_TEXT_V_ALIGN_TOP;
+            // Horizontal pins: name above (negative Y) aligned to same Y offset logic as numbers.
+            info->m_TextPosition = { pinPos.x, pinPos.y - ( maxHalfHeight + clearance ) };
+            info->m_Angle = ANGLE_HORIZONTAL;
+            info->m_HAlign = GR_TEXT_H_ALIGN_CENTER;
+            info->m_VAlign = GR_TEXT_V_ALIGN_CENTER;
+        }
     }
-
-    transformTextForPin( *info );
     return info;
 }
 
 
+// (Removed duplicate later GetPinNumberInfo – earlier definition retained at top of file.)
+
+
 std::optional<PIN_LAYOUT_CACHE::TEXT_INFO>
 PIN_LAYOUT_CACHE::GetPinElectricalTypeInfo( int aShadowWidth )
 {

eeschema/pin_layout_cache.h

@@ -1,11 +1,11 @@
 /*
  * This program source code file is part of KiCad, a free EDA CAD application.
  *
- * Copyright The KiCad Developers, see AUTHORS.txt for contributors.
+ * Copyright The KiCad Developers
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
+ * as published by the Free Software Foundation; either version 3
  * of the License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
@@ -14,13 +14,11 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program; if not, you may find one here:
- * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
- * or you may search the http://www.gnu.org website for the version 2 license,
- * or you may write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ * along with this program; if not, you may find one at
+ * http://www.gnu.org/licenses/
  */
 
+
 #pragma once
 
 #include <optional>

eeschema/sch_file_versions.h

@@ -55,7 +55,8 @@
 //#define SEXPR_SYMBOL_LIB_FILE_VERSION  20241209  // Private flags for SCH_FIELDs
 //#define SEXPR_SYMBOL_LIB_FILE_VERSION  20250318  // ~ no longer means empty text
 //#define SEXPR_SYMBOL_LIB_FILE_VERSION  20250324  // Jumper pin groups
-#define   SEXPR_SYMBOL_LIB_FILE_VERSION  20250829  // Rounded Rectangles
+//#define SEXPR_SYMBOL_LIB_FILE_VERSION  20250829  // Rounded Rectangles
+#define SEXPR_SYMBOL_LIB_FILE_VERSION  20250901  // Stacked Pin notation
 
 /**
  * Schematic file version.
@@ -126,4 +127,5 @@
 //#define SEXPR_SCHEMATIC_FILE_VERSION 20250513  // Groups can have design block lib_id
 //#define SEXPR_SCHEMATIC_FILE_VERSION 20250610  // DNP, etc. flags for rule areas
 //#define SEXPR_SCHEMATIC_FILE_VERSION 20250827  // Custom body styles
-#define   SEXPR_SCHEMATIC_FILE_VERSION 20250829  // Rounded Rectangles
+//#define SEXPR_SCHEMATIC_FILE_VERSION 20250829  // Rounded Rectangles
+#define SEXPR_SCHEMATIC_FILE_VERSION 20250901  // Stacked Pin notation

eeschema/sch_io/cadstar/cadstar_sch_archive_loader.cpp

@@ -3300,7 +3300,7 @@ void CADSTAR_SCH_ARCHIVE_LOADER::fixUpLibraryPins( LIB_SYMBOL* aSymbolToFix, int
         }
     }
 
-    for( SCH_PIN* pin : aSymbolToFix->GetPins( aGateNumber, 0 ) )
+    for( SCH_PIN* pin : aSymbolToFix->GetGraphicalPins( aGateNumber, 0 ) )
     {
         auto setPinOrientation =
                 [&]( const EDA_ANGLE& aAngle )

eeschema/sch_painter.cpp

@@ -64,6 +64,7 @@
 #include <advanced_config.h>
 #include <settings/settings_manager.h>
 #include <stroke_params.h>
+#include <string_utils.h>
 #include "sch_painter.h"
 #include "common.h"
 
@@ -1182,6 +1183,449 @@ void SCH_PAINTER::draw( const SCH_PIN* aPin, int aLayer, bool aDimmed )
                 return aTextSize * aGal.GetWorldScale() < BITMAP_FONT_SIZE_THRESHOLD;
             };
 
+    // Helper function for drawing braces around multi-line text
+    const auto drawBrace =
+            [&]( KIGFX::GAL& aGal, const VECTOR2D& aTop, const VECTOR2D& aBottom,
+                 int aBraceWidth, bool aLeftBrace, const TEXT_ATTRIBUTES& aAttrs )
+            {
+                // Draw a simple brace using line segments, accounting for text rotation
+                VECTOR2D mid = ( aTop + aBottom ) / 2.0;
+
+                aGal.SetLineWidth( aAttrs.m_StrokeWidth );
+                aGal.SetIsFill( false );
+                aGal.SetIsStroke( true );
+
+                // Calculate brace points in text coordinate system
+                VECTOR2D p1 = aTop;
+                VECTOR2D p2 = aTop;
+                VECTOR2D p3 = mid;
+                VECTOR2D p4 = aBottom;
+                VECTOR2D p5 = aBottom;
+
+                // Apply brace offset based on text orientation
+                if( aAttrs.m_Angle == ANGLE_VERTICAL )
+                {
+                    // For vertical text, braces extend in the Y direction
+                    // "Left" brace is actually towards negative Y, "right" towards positive Y
+                    double braceOffset = aLeftBrace ? -aBraceWidth : aBraceWidth;
+                    p2.y += braceOffset / 2;
+                    p3.y += braceOffset;
+                    p4.y += braceOffset / 2;
+                }
+                else
+                {
+                    // For horizontal text, braces extend in the X direction
+                    double braceOffset = aLeftBrace ? -aBraceWidth : aBraceWidth;
+                    p2.x += braceOffset / 2;
+                    p3.x += braceOffset;
+                    p4.x += braceOffset / 2;
+                }
+
+                // Draw the brace segments
+                aGal.DrawLine( p1, p2 );
+                aGal.DrawLine( p2, p3 );
+                aGal.DrawLine( p3, p4 );
+                aGal.DrawLine( p4, p5 );
+            };
+
+    const auto drawBracesAroundText =
+            [&]( KIGFX::GAL& aGal, const wxArrayString& aLines, const VECTOR2D& aStartPos,
+                 int aLineSpacing, const TEXT_ATTRIBUTES& aAttrs )
+            {
+                if( aLines.size() <= 1 )
+                    return;
+
+                // Calculate brace dimensions
+                int braceWidth = aAttrs.m_Size.x / 3;  // Make braces a bit larger
+
+                // Find the maximum line width to position braces
+                int maxLineWidth = 0;
+                KIFONT::FONT* font = aAttrs.m_Font;
+                if( !font )
+                    font = KIFONT::FONT::GetFont( eeconfig()->m_Appearance.default_font );
+
+                for( const wxString& line : aLines )
+                {
+                    wxString trimmedLine = line;
+                    trimmedLine.Trim( true ).Trim( false );
+                    VECTOR2I lineExtents = font->StringBoundaryLimits( trimmedLine, aAttrs.m_Size,
+                                                                      aAttrs.m_StrokeWidth, false, false,
+                                                                      KIFONT::METRICS() );
+                    maxLineWidth = std::max( maxLineWidth, lineExtents.x );
+                }
+
+                // Calculate brace positions based on text vertical alignment and rotation
+                VECTOR2D braceStart = aStartPos;
+                VECTOR2D braceEnd = aStartPos;
+
+                // Extend braces beyond the text bounds
+                int textHeight = aAttrs.m_Size.y;
+                int extraHeight = textHeight / 3;  // Extend braces by 1/3 of text height beyond text
+
+                if( aAttrs.m_Angle == ANGLE_VERTICAL )
+                {
+                    // For vertical text, lines are spaced horizontally and braces are horizontal
+                    braceEnd.x += ( aLines.size() - 1 ) * aLineSpacing;
+
+                    // Extend braces horizontally to encompass all lines plus extra space
+                    braceStart.x -= 2 * extraHeight;
+
+                    // Position braces in the perpendicular direction (Y) with proper spacing
+                    int braceSpacing = maxLineWidth / 2 + braceWidth;
+
+                    VECTOR2D topBraceStart = braceStart;
+                    topBraceStart.y -= braceSpacing;
+
+                    VECTOR2D topBraceEnd = braceEnd;
+                    topBraceEnd.y -= braceSpacing;
+
+                    drawBrace( aGal, topBraceStart, topBraceEnd, braceWidth, true, aAttrs );
+
+                    VECTOR2D bottomBraceStart = braceStart;
+                    bottomBraceStart.y += braceSpacing;
+
+                    VECTOR2D bottomBraceEnd = braceEnd;
+                    bottomBraceEnd.y += braceSpacing;
+
+                    drawBrace( aGal, bottomBraceStart, bottomBraceEnd, braceWidth, false, aAttrs );
+                }
+                else
+                {
+                    // For horizontal text, lines are spaced vertically and braces are vertical
+                    braceEnd.y += ( aLines.size() - 1 ) * aLineSpacing;
+
+                    // Extend braces vertically to encompass all lines plus extra space
+                    braceStart.y -= 2 * extraHeight;
+
+                    // Position braces in the perpendicular direction (X) with proper spacing
+                    int braceSpacing = maxLineWidth / 2 + braceWidth;
+
+                    // Draw left brace
+                    VECTOR2D leftTop = braceStart;
+                    leftTop.x -= braceSpacing;
+
+                    VECTOR2D leftBottom = braceEnd;
+                    leftBottom.x -= braceSpacing;
+
+                    drawBrace( aGal, leftTop, leftBottom, braceWidth, true, aAttrs );
+
+                    // Draw right brace
+                    VECTOR2D rightTop = braceStart;
+                    rightTop.x += braceSpacing;
+
+                    VECTOR2D rightBottom = braceEnd;
+                    rightBottom.x += braceSpacing;
+
+                    drawBrace( aGal, rightTop, rightBottom, braceWidth, false, aAttrs );
+                }
+            };
+
+    const auto drawBracesAroundTextBitmap =
+            [&]( KIGFX::GAL& aGal, const wxArrayString& aLines, const VECTOR2D& aStartPos,
+                 int aLineSpacing, const TEXT_ATTRIBUTES& aAttrs )
+            {
+                // Simplified brace drawing for bitmap text
+                if( aLines.size() <= 1 )
+                    return;
+
+                int braceWidth = aAttrs.m_Size.x / 4;
+
+                // Estimate max line width (less precise for bitmap text)
+                int maxLineWidth = aAttrs.m_Size.x * 4;  // Conservative estimate
+
+                // Calculate brace positions based on rotation
+                VECTOR2D braceStart = aStartPos;
+                VECTOR2D braceEnd = aStartPos;
+
+                int textHalfHeight = aAttrs.m_Size.y / 2;
+
+                if( aAttrs.m_Angle == ANGLE_VERTICAL )
+                {
+                    // For vertical text, lines are spaced horizontally
+                    braceEnd.x += ( aLines.size() - 1 ) * aLineSpacing;
+
+                    VECTOR2D leftStart = braceStart;
+                    leftStart.y -= maxLineWidth / 2 + braceWidth / 2;
+
+                    VECTOR2D leftEnd = braceEnd;
+                    leftEnd.y -= maxLineWidth / 2 + braceWidth / 2;
+
+                    drawBrace( aGal, leftStart, leftEnd, braceWidth, true, aAttrs );
+
+                    VECTOR2D rightStart = braceStart;
+                    rightStart.y += maxLineWidth / 2 + braceWidth / 2;
+
+                    VECTOR2D rightEnd = braceEnd;
+                    rightEnd.y += maxLineWidth / 2 + braceWidth / 2;
+
+                    drawBrace( aGal, rightStart, rightEnd, braceWidth, false, aAttrs );
+                }
+                else
+                {
+                    // For horizontal text, lines are spaced vertically
+                    braceEnd.y += ( aLines.size() - 1 ) * aLineSpacing;
+
+                    VECTOR2D braceTop = braceStart;
+                    braceTop.y -= textHalfHeight;
+
+                    VECTOR2D braceBottom = braceEnd;
+                    braceBottom.y += textHalfHeight;
+
+                    VECTOR2D leftTop = braceTop;
+                    leftTop.x -= maxLineWidth / 2 + braceWidth / 2;
+
+                    VECTOR2D leftBottom = braceBottom;
+                    leftBottom.x -= maxLineWidth / 2 + braceWidth / 2;
+
+                    drawBrace( aGal, leftTop, leftBottom, braceWidth, true, aAttrs );
+
+                    VECTOR2D rightTop = braceTop;
+                    rightTop.x += maxLineWidth / 2 + braceWidth / 2;
+
+                    VECTOR2D rightBottom = braceBottom;
+                    rightBottom.x += maxLineWidth / 2 + braceWidth / 2;
+
+                    drawBrace( aGal, rightTop, rightBottom, braceWidth, false, aAttrs );
+                }
+            };
+
+    // Helper functions for drawing multi-line pin text with braces
+    const auto drawMultiLineText =
+            [&]( KIGFX::GAL& aGal, const wxString& aText, const VECTOR2D& aPosition,
+                 const TEXT_ATTRIBUTES& aAttrs, const KIFONT::METRICS& aFontMetrics )
+            {
+                // Check if this is multi-line stacked pin text with braces
+                if( aText.StartsWith( "[" ) && aText.EndsWith( "]" ) && aText.Contains( "\n" ) )
+                {
+                    // Extract content between braces and split into lines
+                    wxString content = aText.Mid( 1, aText.Length() - 2 );
+                    wxArrayString lines;
+                    wxStringSplit( content, lines, '\n' );
+
+                    if( lines.size() > 1 )
+                    {
+                        // Calculate line spacing (similar to EDA_TEXT::GetInterline)
+                        int lineSpacing = KiROUND( aAttrs.m_Size.y * 1.3 );  // 130% of text height
+
+                        // Calculate positioning based on text alignment and rotation
+                        VECTOR2D startPos = aPosition;
+
+                        if( aAttrs.m_Angle == ANGLE_VERTICAL )
+                        {
+                            // For vertical text, lines are spaced horizontally
+                            // Adjust start position based on horizontal alignment
+                            if( aAttrs.m_Halign == GR_TEXT_H_ALIGN_RIGHT )
+                            {
+                                int totalWidth = ( lines.size() - 1 ) * lineSpacing;
+                                startPos.x -= totalWidth;
+                            }
+                            else if( aAttrs.m_Halign == GR_TEXT_H_ALIGN_CENTER )
+                            {
+                                int totalWidth = ( lines.size() - 1 ) * lineSpacing;
+                                startPos.x -= totalWidth / 2;
+                            }
+
+                            // Draw each line
+                            for( size_t i = 0; i < lines.size(); i++ )
+                            {
+                                VECTOR2D linePos = startPos;
+                                linePos.x += i * lineSpacing;
+
+                                wxString line = lines[i];
+                                line.Trim( true ).Trim( false );
+
+                                strokeText( aGal, line, linePos, aAttrs, aFontMetrics );
+                            }
+                        }
+                        else
+                        {
+                            // For horizontal text, lines are spaced vertically
+                            // Adjust start position based on vertical alignment
+                            if( aAttrs.m_Valign == GR_TEXT_V_ALIGN_BOTTOM )
+                            {
+                                int totalHeight = ( lines.size() - 1 ) * lineSpacing;
+                                startPos.y -= totalHeight;
+                            }
+                            else if( aAttrs.m_Valign == GR_TEXT_V_ALIGN_CENTER )
+                            {
+                                int totalHeight = ( lines.size() - 1 ) * lineSpacing;
+                                startPos.y -= totalHeight / 2;
+                            }
+
+                            // Draw each line
+                            for( size_t i = 0; i < lines.size(); i++ )
+                            {
+                                VECTOR2D linePos = startPos;
+                                linePos.y += i * lineSpacing;
+
+                                wxString line = lines[i];
+                                line.Trim( true ).Trim( false );
+
+                                strokeText( aGal, line, linePos, aAttrs, aFontMetrics );
+                            }
+                        }
+
+                        // Draw braces around the text
+                        drawBracesAroundText( aGal, lines, startPos, lineSpacing, aAttrs );
+                        return;
+                    }
+                }
+
+                // Fallback to regular single-line text
+                strokeText( aGal, aText, aPosition, aAttrs, aFontMetrics );
+            };
+
+    const auto drawMultiLineTextBox =
+            [&]( KIGFX::GAL& aGal, const wxString& aText, const VECTOR2D& aPosition,
+                 const TEXT_ATTRIBUTES& aAttrs, const KIFONT::METRICS& aFontMetrics )
+            {
+                // Similar to drawMultiLineText but uses boxText for outline fonts
+                if( aText.StartsWith( "[" ) && aText.EndsWith( "]" ) && aText.Contains( "\n" ) )
+                {
+                    wxString content = aText.Mid( 1, aText.Length() - 2 );
+                    wxArrayString lines;
+                    wxStringSplit( content, lines, '\n' );
+
+                    if( lines.size() > 1 )
+                    {
+                        int lineSpacing = KiROUND( aAttrs.m_Size.y * 1.3 );
+                        VECTOR2D startPos = aPosition;
+
+                        if( aAttrs.m_Angle == ANGLE_VERTICAL )
+                        {
+                            // For vertical text, lines are spaced horizontally
+                            if( aAttrs.m_Halign == GR_TEXT_H_ALIGN_RIGHT )
+                            {
+                                int totalWidth = ( lines.size() - 1 ) * lineSpacing;
+                                startPos.x -= totalWidth;
+                            }
+                            else if( aAttrs.m_Halign == GR_TEXT_H_ALIGN_CENTER )
+                            {
+                                int totalWidth = ( lines.size() - 1 ) * lineSpacing;
+                                startPos.x -= totalWidth / 2;
+                            }
+
+                            for( size_t i = 0; i < lines.size(); i++ )
+                            {
+                                VECTOR2D linePos = startPos;
+                                linePos.x += i * lineSpacing;
+
+                                wxString line = lines[i];
+                                line.Trim( true ).Trim( false );
+
+                                boxText( aGal, line, linePos, aAttrs, aFontMetrics );
+                            }
+                        }
+                        else
+                        {
+                            // For horizontal text, lines are spaced vertically
+                            if( aAttrs.m_Valign == GR_TEXT_V_ALIGN_BOTTOM )
+                            {
+                                int totalHeight = ( lines.size() - 1 ) * lineSpacing;
+                                startPos.y -= totalHeight;
+                            }
+                            else if( aAttrs.m_Valign == GR_TEXT_V_ALIGN_CENTER )
+                            {
+                                int totalHeight = ( lines.size() - 1 ) * lineSpacing;
+                                startPos.y -= totalHeight / 2;
+                            }
+
+                            for( size_t i = 0; i < lines.size(); i++ )
+                            {
+                                VECTOR2D linePos = startPos;
+                                linePos.y += i * lineSpacing;
+
+                                wxString line = lines[i];
+                                line.Trim( true ).Trim( false );
+
+                                boxText( aGal, line, linePos, aAttrs, aFontMetrics );
+                            }
+                        }
+
+                        drawBracesAroundText( aGal, lines, startPos, lineSpacing, aAttrs );
+                        return;
+                    }
+                }
+
+                boxText( aGal, aText, aPosition, aAttrs, aFontMetrics );
+            };
+
+    const auto drawMultiLineBitmapText =
+            [&]( KIGFX::GAL& aGal, const wxString& aText, const VECTOR2D& aPosition,
+                 const TEXT_ATTRIBUTES& aAttrs )
+            {
+                // Similar to drawMultiLineText but uses bitmapText
+                if( aText.StartsWith( "[" ) && aText.EndsWith( "]" ) && aText.Contains( "\n" ) )
+                {
+                    wxString content = aText.Mid( 1, aText.Length() - 2 );
+                    wxArrayString lines;
+                    wxStringSplit( content, lines, '\n' );
+
+                    if( lines.size() > 1 )
+                    {
+                        int lineSpacing = KiROUND( aAttrs.m_Size.y * 1.3 );
+                        VECTOR2D startPos = aPosition;
+
+                        if( aAttrs.m_Angle == ANGLE_VERTICAL )
+                        {
+                            // For vertical text, lines are spaced horizontally
+                            if( aAttrs.m_Halign == GR_TEXT_H_ALIGN_RIGHT )
+                            {
+                                int totalWidth = ( lines.size() - 1 ) * lineSpacing;
+                                startPos.x -= totalWidth;
+                            }
+                            else if( aAttrs.m_Halign == GR_TEXT_H_ALIGN_CENTER )
+                            {
+                                int totalWidth = ( lines.size() - 1 ) * lineSpacing;
+                                startPos.x -= totalWidth / 2;
+                            }
+
+                            for( size_t i = 0; i < lines.size(); i++ )
+                            {
+                                VECTOR2D linePos = startPos;
+                                linePos.x += i * lineSpacing;
+
+                                wxString line = lines[i];
+                                line.Trim( true ).Trim( false );
+
+                                bitmapText( aGal, line, linePos, aAttrs );
+                            }
+                        }
+                        else
+                        {
+                            // For horizontal text, lines are spaced vertically
+                            if( aAttrs.m_Valign == GR_TEXT_V_ALIGN_BOTTOM )
+                            {
+                                int totalHeight = ( lines.size() - 1 ) * lineSpacing;
+                                startPos.y -= totalHeight;
+                            }
+                            else if( aAttrs.m_Valign == GR_TEXT_V_ALIGN_CENTER )
+                            {
+                                int totalHeight = ( lines.size() - 1 ) * lineSpacing;
+                                startPos.y -= totalHeight / 2;
+                            }
+
+                            for( size_t i = 0; i < lines.size(); i++ )
+                            {
+                                VECTOR2D linePos = startPos;
+                                linePos.y += i * lineSpacing;
+
+                                wxString line = lines[i];
+                                line.Trim( true ).Trim( false );
+
+                                bitmapText( aGal, line, linePos, aAttrs );
+                            }
+                        }
+
+                        // Draw braces with bitmap text (simplified version)
+                        drawBracesAroundTextBitmap( aGal, lines, startPos, lineSpacing, aAttrs );
+                        return;
+                    }
+                }
+
+                bitmapText( aGal, aText, aPosition, aAttrs );
+            };
+
     const auto drawTextInfo =
             [&]( const PIN_LAYOUT_CACHE::TEXT_INFO& aTextInfo, const COLOR4D& aColor )
             {
@@ -1206,23 +1650,23 @@ void SCH_PAINTER::draw( const SCH_PIN* aPin, int aLayer, bool aDimmed )
 
                     if( !attrs.m_Font->IsOutline() )
                     {
-                        strokeText( *m_gal, aTextInfo.m_Text, aTextInfo.m_TextPosition, attrs,
+                        drawMultiLineText( *m_gal, aTextInfo.m_Text, aTextInfo.m_TextPosition, attrs,
                                          aPin->GetFontMetrics() );
                     }
                     else
                     {
-                        boxText( *m_gal, aTextInfo.m_Text, aTextInfo.m_TextPosition, attrs,
+                        drawMultiLineTextBox( *m_gal, aTextInfo.m_Text, aTextInfo.m_TextPosition, attrs,
                                             aPin->GetFontMetrics() );
                     }
                 }
                 else if( nonCached( aPin ) && renderTextAsBitmap )
                 {
-                    bitmapText( *m_gal, aTextInfo.m_Text, aTextInfo.m_TextPosition, attrs );
+                    drawMultiLineBitmapText( *m_gal, aTextInfo.m_Text, aTextInfo.m_TextPosition, attrs );
                     const_cast<SCH_PIN*>( aPin )->SetFlags( IS_SHOWN_AS_BITMAP );
                 }
                 else
                 {
-                    strokeText( *m_gal, aTextInfo.m_Text, aTextInfo.m_TextPosition, attrs,
+                    drawMultiLineText( *m_gal, aTextInfo.m_Text, aTextInfo.m_TextPosition, attrs,
                                      aPin->GetFontMetrics() );
                     const_cast<SCH_PIN*>( aPin )->SetFlags( IS_SHOWN_AS_BITMAP );
                 }
@@ -2251,11 +2695,11 @@ void SCH_PAINTER::draw( const SCH_SYMBOL* aSymbol, int aLayer )
     // Use dummy symbol if the actual couldn't be found (or couldn't be locked).
     LIB_SYMBOL* originalSymbol =
             aSymbol->GetLibSymbolRef() ? aSymbol->GetLibSymbolRef().get() : LIB_SYMBOL::GetDummy();
-    std::vector<SCH_PIN*> originalPins = originalSymbol->GetPins( unit, bodyStyle );
+    std::vector<SCH_PIN*> originalPins = originalSymbol->GetGraphicalPins( unit, bodyStyle );
 
     // Copy the source so we can re-orient and translate it.
     LIB_SYMBOL            tempSymbol( *originalSymbol );
-    std::vector<SCH_PIN*> tempPins = tempSymbol.GetPins( unit, bodyStyle );
+    std::vector<SCH_PIN*> tempPins = tempSymbol.GetGraphicalPins( unit, bodyStyle );
 
     tempSymbol.SetFlags( aSymbol->GetFlags() );
 

eeschema/sch_pin.cpp

@@ -39,6 +39,49 @@
 #include <trigo.h>
 #include <string_utils.h>
 
+wxString FormatStackedPinForDisplay( const wxString& aPinNumber, int aPinLength, int aTextSize, KIFONT::FONT* aFont,
+                                     const KIFONT::METRICS& aFontMetrics )
+{
+    // Check if this is stacked pin notation: [A,B,C]
+    if( !aPinNumber.StartsWith( "[" ) || !aPinNumber.EndsWith( "]" ) )
+        return aPinNumber;
+
+    const int minPinTextWidth = schIUScale.MilsToIU( 50 );
+    const int maxPinTextWidth = std::max( aPinLength, minPinTextWidth );
+
+    VECTOR2D fontSize( aTextSize, aTextSize );
+    int      penWidth = GetPenSizeForNormal( aTextSize );
+    VECTOR2I textExtents = aFont->StringBoundaryLimits( aPinNumber, fontSize, penWidth, false, false, aFontMetrics );
+
+    if( textExtents.x <= maxPinTextWidth )
+        return aPinNumber; // Fits already
+
+    // Strip brackets and split by comma
+    wxString      inner = aPinNumber.Mid( 1, aPinNumber.Length() - 2 );
+    wxArrayString parts;
+    wxStringSplit( inner, parts, ',' );
+
+    if( parts.empty() )
+        return aPinNumber; // malformed; fallback
+
+    // Build multi-line representation inside braces, each line trimmed
+    wxString result = "[";
+
+    for( size_t i = 0; i < parts.size(); ++i )
+    {
+        wxString line = parts[i];
+        line.Trim( true ).Trim( false );
+
+        if( i > 0 )
+            result += "\n";
+
+        result += line;
+    }
+
+    result += "]";
+    return result;
+}
+
 
 // small margin in internal units between the pin text and the pin line
 #define PIN_TEXT_MARGIN 4
@@ -431,15 +474,24 @@ void SCH_PIN::SetIsDangling( bool aIsDangling )
 
 bool SCH_PIN::IsStacked( const SCH_PIN* aPin ) const
 {
-    bool isConnectableType_a = GetType() == ELECTRICAL_PINTYPE::PT_PASSIVE
-                            || GetType() == ELECTRICAL_PINTYPE::PT_NIC;
-    bool isConnectableType_b = aPin->GetType() == ELECTRICAL_PINTYPE::PT_PASSIVE
-                            || aPin->GetType() == ELECTRICAL_PINTYPE::PT_NIC;
+    const auto isPassiveOrNic = []( ELECTRICAL_PINTYPE t )
+    {
+        return t == ELECTRICAL_PINTYPE::PT_PASSIVE || t == ELECTRICAL_PINTYPE::PT_NIC;
+    };
 
-    return m_parent == aPin->GetParent()
-           && GetPosition() == aPin->GetPosition()
-           && GetName() == aPin->GetName()
-           && ( GetType() == aPin->GetType() || isConnectableType_a || isConnectableType_b );
+    const bool sameParent = m_parent == aPin->GetParent();
+    const bool samePos    = GetPosition() == aPin->GetPosition();
+    const bool sameName   = GetName() == aPin->GetName();
+    const bool typeCompat = GetType() == aPin->GetType()
+                             || isPassiveOrNic( GetType() )
+                             || isPassiveOrNic( aPin->GetType() );
+
+    wxLogTrace( "KICAD_STACKED_PINS",
+                wxString::Format( "IsStacked: this='%s/%s' other='%s/%s' sameParent=%d samePos=%d sameName=%d typeCompat=%d",
+                                  GetName(), GetNumber(), aPin->GetName(), aPin->GetNumber(), sameParent,
+                                  samePos, sameName, typeCompat ) );
+
+    return sameParent && samePos && sameName && typeCompat;
 }
 
 
@@ -538,6 +590,46 @@ wxString SCH_PIN::GetShownNumber() const
 }
 
 
+std::vector<wxString> SCH_PIN::GetStackedPinNumbers( bool* aValid ) const
+{
+    wxString shown = GetShownNumber();
+    wxLogTrace( "KICAD_STACKED_PINS",
+                wxString::Format( "GetStackedPinNumbers: shown='%s'", shown ) );
+
+    std::vector<wxString> numbers = ExpandStackedPinNotation( shown, aValid );
+
+    // Log the expansion for debugging
+    wxLogTrace( "KICAD_STACKED_PINS",
+                wxString::Format( "Expanded '%s' to %zu pins", shown, numbers.size() ) );
+    for( const wxString& num : numbers )
+    {
+        wxLogTrace( "KICAD_STACKED_PINS", wxString::Format( " -> '%s'", num ) );
+    }
+
+    return numbers;
+}
+
+std::optional<wxString> SCH_PIN::GetSmallestLogicalNumber() const
+{
+    bool valid = false;
+    auto numbers = GetStackedPinNumbers( &valid );
+
+    if( valid && !numbers.empty() )
+        return numbers.front();    // Already in ascending order
+
+    return std::nullopt;
+}
+
+
+wxString SCH_PIN::GetEffectivePadNumber() const
+{
+    if( auto smallest = GetSmallestLogicalNumber() )
+        return *smallest;
+
+    return GetShownNumber();
+}
+
+
 void SCH_PIN::SetNumber( const wxString& aNumber )
 {
     if( m_number == aNumber )
@@ -778,12 +870,17 @@ void SCH_PIN::PlotPinTexts( PLOTTER *aPlotter, const VECTOR2I &aPinPos, PIN_ORIE
     wxString         name = GetShownName();
     wxString         number = GetShownNumber();
 
+    // Apply stacked pin display formatting (reuse helper from pin_layout_cache)
+    if( aDrawPinNum && !number.IsEmpty() )
+    {
+        const KIFONT::METRICS& metrics = GetFontMetrics();
+        number = FormatStackedPinForDisplay( number, GetLength(), GetNumberTextSize(), font, metrics );
+    }
+
     if( name.IsEmpty() || m_nameTextSize == 0 )
         aDrawPinName = false;
-
     if( number.IsEmpty() || m_numTextSize == 0 )
         aDrawPinNum = false;
-
     if( !aDrawPinNum && !aDrawPinName )
         return;
 
@@ -792,169 +889,257 @@ void SCH_PIN::PlotPinTexts( PLOTTER *aPlotter, const VECTOR2I &aPinPos, PIN_ORIE
     int name_offset = schIUScale.MilsToIU( PIN_TEXT_MARGIN ) + namePenWidth;
     int num_offset  = schIUScale.MilsToIU( PIN_TEXT_MARGIN ) + numPenWidth;
 
-    /* Get the num and name colors */
     COLOR4D nameColor = settings->GetLayerColor( LAYER_PINNAM );
     COLOR4D numColor  = settings->GetLayerColor( LAYER_PINNUM );
     COLOR4D bg = settings->GetBackgroundColor();
-
     if( bg == COLOR4D::UNSPECIFIED || !aPlotter->GetColorMode() )
         bg = COLOR4D::WHITE;
-
     if( aDimmed )
     {
-        nameColor.Desaturate( );
-        numColor.Desaturate( );
+        nameColor.Desaturate();
+        numColor.Desaturate();
         nameColor = nameColor.Mix( bg, 0.5f );
         numColor = numColor.Mix( bg, 0.5f );
     }
 
     int x1 = aPinPos.x;
     int y1 = aPinPos.y;
-
     switch( aPinOrient )
     {
     case PIN_ORIENTATION::PIN_UP:    y1 -= GetLength(); break;
     case PIN_ORIENTATION::PIN_DOWN:  y1 += GetLength(); break;
     case PIN_ORIENTATION::PIN_LEFT:  x1 -= GetLength(); break;
     case PIN_ORIENTATION::PIN_RIGHT: x1 += GetLength(); break;
-    case PIN_ORIENTATION::INHERIT:   wxFAIL_MSG( wxS( "aPinOrient must be resolved!" ) ); break;
+    default: break;
     }
 
-    auto plotName =
-            [&]( int x, int y, const EDA_ANGLE& angle, GR_TEXT_H_ALIGN_T hJustify,
-                 GR_TEXT_V_ALIGN_T vJustify )
+    auto plotSimpleText = [&]( int x, int y, const EDA_ANGLE& angle, GR_TEXT_H_ALIGN_T hJustify,
+                               GR_TEXT_V_ALIGN_T vJustify, const wxString& txt, int size,
+                               int penWidth, const COLOR4D& col )
     {
         TEXT_ATTRIBUTES attrs;
-                attrs.m_StrokeWidth = namePenWidth;
+        attrs.m_StrokeWidth = penWidth;
         attrs.m_Angle = angle;
-                attrs.m_Size = VECTOR2I( GetNameTextSize(), GetNameTextSize() );
+        attrs.m_Size = VECTOR2I( size, size );
         attrs.m_Halign = hJustify;
         attrs.m_Valign = vJustify;
-                attrs.m_Multiline = false;
-
-                aPlotter->PlotText( VECTOR2I( x, y ), nameColor, name, attrs, font,
-                                    GetFontMetrics() );
+        attrs.m_Multiline = false; // we'll manage multi-line manually
+        aPlotter->PlotText( VECTOR2I( x, y ), col, txt, attrs, font, GetFontMetrics() );
     };
 
-    auto plotNum =
-            [&]( int x, int y, const EDA_ANGLE& angle, GR_TEXT_H_ALIGN_T hJustify,
-                 GR_TEXT_V_ALIGN_T vJustify )
+    auto plotMultiLineWithBraces = [&]( int anchorX, int anchorY, bool vertical, bool /*numberBlock*/ )
     {
-                TEXT_ATTRIBUTES attrs;
-                attrs.m_StrokeWidth = numPenWidth;
-                attrs.m_Angle = angle;
-                attrs.m_Size = VECTOR2I( GetNumberTextSize(), GetNumberTextSize() );
-                attrs.m_Halign = hJustify;
-                attrs.m_Valign = vJustify;
-                attrs.m_Multiline = false;
+        // If not multi-line formatted, just plot single line centered.
+        if( !number.StartsWith( "[" ) || !number.EndsWith( "]" ) || !number.Contains( "\n" ) )
+        {
+            plotSimpleText( anchorX, anchorY, vertical ? ANGLE_VERTICAL : ANGLE_HORIZONTAL,
+                            GR_TEXT_H_ALIGN_CENTER, GR_TEXT_V_ALIGN_BOTTOM, number,
+                            GetNumberTextSize(), numPenWidth, numColor );
+            return;
+        }
 
-                aPlotter->PlotText( VECTOR2I( x, y ), numColor, number, attrs, font,
-                                    GetFontMetrics() );
+        wxString content = number.Mid( 1, number.Length() - 2 );
+        wxArrayString lines;
+        wxStringSplit( content, lines, '\n' );
+
+        if( lines.size() <= 1 )
+        {
+            plotSimpleText( anchorX, anchorY, vertical ? ANGLE_VERTICAL : ANGLE_HORIZONTAL,
+                            GR_TEXT_H_ALIGN_CENTER, GR_TEXT_V_ALIGN_BOTTOM, content,
+                            GetNumberTextSize(), numPenWidth, numColor );
+            return;
+        }
+
+        int textSize = GetNumberTextSize();
+        int lineSpacing = KiROUND( textSize * 1.3 );
+        const KIFONT::METRICS& metrics = GetFontMetrics();
+
+        // Measure line widths for brace spacing
+        int maxLineWidth = 0;
+        for( const wxString& rawLine : lines )
+        {
+            wxString trimmed = rawLine; trimmed.Trim(true).Trim(false);
+            VECTOR2I ext = font->StringBoundaryLimits( trimmed, VECTOR2D( textSize, textSize ),
+                                                       GetPenSizeForNormal( textSize ), false, false, metrics );
+            if( ext.x > maxLineWidth )
+                maxLineWidth = ext.x;
+        }
+
+        // Determine starting position
+        int startX = anchorX;
+        int startY = anchorY;
+
+        if( vertical )
+        {
+            int totalWidth = ( (int) lines.size() - 1 ) * lineSpacing;
+            startX -= totalWidth;
+        }
+        else
+        {
+            int totalHeight = ( (int) lines.size() - 1 ) * lineSpacing;
+            startY -= totalHeight;
+        }
+
+        for( size_t i = 0; i < lines.size(); ++i )
+        {
+            wxString l = lines[i]; l.Trim( true ).Trim( false );
+            int lx = startX + ( vertical ? (int) i * lineSpacing : 0 );
+            int ly = startY + ( vertical ? 0 : (int) i * lineSpacing );
+            plotSimpleText( lx, ly, vertical ? ANGLE_VERTICAL : ANGLE_HORIZONTAL,
+                            GR_TEXT_H_ALIGN_CENTER, GR_TEXT_V_ALIGN_BOTTOM, l,
+                            textSize, numPenWidth, numColor );
+        }
+
+        // Now draw braces emulating SCH_PAINTER brace geometry
+        auto plotBrace = [&]( const VECTOR2I& top, const VECTOR2I& bottom, bool leftOrTop, bool isVerticalText )
+        {
+            // Build 4 small segments approximating curly brace
+            VECTOR2I mid = ( top + bottom ) / 2;
+            int braceWidth = textSize / 3; // same scale as painter
+            VECTOR2I p1 = top;
+            VECTOR2I p5 = bottom;
+            VECTOR2I p2 = top;
+            VECTOR2I p3 = mid;
+            VECTOR2I p4 = bottom;
+            int offset = leftOrTop ? -braceWidth : braceWidth;
+
+            if( isVerticalText )
+            {
+                // Text vertical => brace extends in Y (horizontal brace lines across X axis set)
+                // For vertical orientation we offset Y for p2/p3/p4
+                p2.y += offset / 2;
+                p3.y += offset;
+                p4.y += offset / 2;
+            }
+            else
+            {
+                // Horizontal text => brace extends in X
+                p2.x += offset / 2;
+                p3.x += offset;
+                p4.x += offset / 2;
+            }
+
+            aPlotter->MoveTo( p1 ); aPlotter->FinishTo( p2 );
+            aPlotter->MoveTo( p2 ); aPlotter->FinishTo( p3 );
+            aPlotter->MoveTo( p3 ); aPlotter->FinishTo( p4 );
+            aPlotter->MoveTo( p4 ); aPlotter->FinishTo( p5 );
         };
 
-    // Draw the text inside, but the pin numbers outside.
+        aPlotter->SetCurrentLineWidth( numPenWidth );
+        int braceWidth = textSize / 3;
+        int extraHeight = textSize / 3; // extend beyond text block
+
+        if( vertical )
+        {
+            // Lines spaced horizontally, braces horizontal (above & below)
+            int totalWidth = ( (int) lines.size() - 1 ) * lineSpacing;
+            VECTOR2I braceStart( startX - 2 * extraHeight, anchorY );
+            VECTOR2I braceEnd( startX + totalWidth + extraHeight, anchorY );
+            int braceSpacing = maxLineWidth / 2 + braceWidth;
+
+            VECTOR2I topStart = braceStart; topStart.y -= braceSpacing;
+            VECTOR2I topEnd   = braceEnd;   topEnd.y   -= braceSpacing;
+            VECTOR2I bottomStart = braceStart; bottomStart.y += braceSpacing;
+            VECTOR2I bottomEnd   = braceEnd;   bottomEnd.y   += braceSpacing;
+
+            plotBrace( topStart, topEnd, true,  true );  // leftOrTop=true
+            plotBrace( bottomStart, bottomEnd, false, true );
+        }
+        else
+        {
+            // Lines spaced vertically, braces vertical (left & right)
+            int totalHeight = ( (int) lines.size() - 1 ) * lineSpacing;
+            VECTOR2I braceStart( anchorX, startY - 2 * extraHeight );
+            VECTOR2I braceEnd( anchorX, startY + totalHeight + extraHeight );
+            int braceSpacing = maxLineWidth / 2 + braceWidth;
+
+            VECTOR2I leftTop = braceStart;   leftTop.x  -= braceSpacing;
+            VECTOR2I leftBot = braceEnd;     leftBot.x  -= braceSpacing;
+            VECTOR2I rightTop = braceStart;  rightTop.x += braceSpacing;
+            VECTOR2I rightBot = braceEnd;    rightBot.x += braceSpacing;
+
+            plotBrace( leftTop, leftBot, true,  false );
+            plotBrace( rightTop, rightBot, false, false );
+        }
+    };
+
+    // Logic largely mirrors original single-line placement but calls multi-line path for numbers
     if( aTextInside )
     {
-        if( ( aPinOrient == PIN_ORIENTATION::PIN_LEFT )
-          || ( aPinOrient == PIN_ORIENTATION::PIN_RIGHT ) ) // It's a horizontal line.
+        if( ( aPinOrient == PIN_ORIENTATION::PIN_LEFT ) || ( aPinOrient == PIN_ORIENTATION::PIN_RIGHT ) )
         {
             if( aDrawPinName )
             {
                 if( aPinOrient == PIN_ORIENTATION::PIN_RIGHT )
-                {
-                    plotName( x1 + aTextInside, y1, ANGLE_HORIZONTAL,
-                              GR_TEXT_H_ALIGN_LEFT, GR_TEXT_V_ALIGN_CENTER );
+                    plotSimpleText( x1 + aTextInside, y1, ANGLE_HORIZONTAL, GR_TEXT_H_ALIGN_LEFT,
+                                    GR_TEXT_V_ALIGN_CENTER, name, GetNameTextSize(), namePenWidth, nameColor );
+                else
+                    plotSimpleText( x1 - aTextInside, y1, ANGLE_HORIZONTAL, GR_TEXT_H_ALIGN_RIGHT,
+                                    GR_TEXT_V_ALIGN_CENTER, name, GetNameTextSize(), namePenWidth, nameColor );
             }
-                else    // orient == PIN_LEFT
-                {
-                    plotName( x1 - aTextInside, y1, ANGLE_HORIZONTAL,
-                              GR_TEXT_H_ALIGN_RIGHT, GR_TEXT_V_ALIGN_CENTER );
-                }
-            }
-
             if( aDrawPinNum )
-            {
-                plotNum( ( x1 + aPinPos.x) / 2, y1 - num_offset, ANGLE_HORIZONTAL,
-                         GR_TEXT_H_ALIGN_CENTER, GR_TEXT_V_ALIGN_BOTTOM );
+                plotMultiLineWithBraces( ( x1 + aPinPos.x ) / 2, y1 - num_offset, false, true );
         }
-        }
-        else         // It's a vertical line.
+        else
         {
             if( aPinOrient == PIN_ORIENTATION::PIN_DOWN )
             {
                 if( aDrawPinName )
-                {
-                    plotName( x1, y1 + aTextInside, ANGLE_VERTICAL,
-                              GR_TEXT_H_ALIGN_RIGHT, GR_TEXT_V_ALIGN_CENTER );
-                }
-
+                    plotSimpleText( x1, y1 + aTextInside, ANGLE_VERTICAL, GR_TEXT_H_ALIGN_RIGHT,
+                                    GR_TEXT_V_ALIGN_CENTER, name, GetNameTextSize(), namePenWidth, nameColor );
                 if( aDrawPinNum )
-                {
-                    plotNum( x1 - num_offset, ( y1 + aPinPos.y) / 2, ANGLE_VERTICAL,
-                             GR_TEXT_H_ALIGN_CENTER, GR_TEXT_V_ALIGN_BOTTOM );
+                    plotMultiLineWithBraces( x1 - num_offset, ( y1 + aPinPos.y ) / 2, true, true );
             }
-            }
-            else        /* PIN_UP */
+            else // PIN_UP
             {
                 if( aDrawPinName )
-                {
-                    plotName( x1, y1 - aTextInside, ANGLE_VERTICAL,
-                              GR_TEXT_H_ALIGN_LEFT, GR_TEXT_V_ALIGN_CENTER );
-                }
-
+                    plotSimpleText( x1, y1 - aTextInside, ANGLE_VERTICAL, GR_TEXT_H_ALIGN_LEFT,
+                                    GR_TEXT_V_ALIGN_CENTER, name, GetNameTextSize(), namePenWidth, nameColor );
                 if( aDrawPinNum )
-                {
-                    plotNum( x1 - num_offset, ( y1 + aPinPos.y) / 2, ANGLE_VERTICAL,
-                             GR_TEXT_H_ALIGN_CENTER, GR_TEXT_V_ALIGN_BOTTOM );
+                    plotMultiLineWithBraces( x1 - num_offset, ( y1 + aPinPos.y ) / 2, true, true );
             }
         }
     }
-    }
-    else     // Draw num & text pin outside.
-    {
-        if( ( aPinOrient == PIN_ORIENTATION::PIN_LEFT )
-            || ( aPinOrient == PIN_ORIENTATION::PIN_RIGHT ) )
-        {
-            // It's an horizontal line.
-            if( aDrawPinName && aDrawPinNum )
-            {
-                plotName( ( x1 + aPinPos.x) / 2, y1 - name_offset, ANGLE_HORIZONTAL,
-                          GR_TEXT_H_ALIGN_CENTER, GR_TEXT_V_ALIGN_BOTTOM );
-
-                plotNum( ( x1 + aPinPos.x) / 2, y1 + num_offset, ANGLE_HORIZONTAL,
-                          GR_TEXT_H_ALIGN_CENTER, GR_TEXT_V_ALIGN_TOP );
-            }
-            else if( aDrawPinName )
-            {
-                plotName( ( x1 + aPinPos.x) / 2, y1 - name_offset, ANGLE_HORIZONTAL,
-                          GR_TEXT_H_ALIGN_CENTER, GR_TEXT_V_ALIGN_BOTTOM );
-            }
-            else if( aDrawPinNum )
-            {
-                plotNum( ( x1 + aPinPos.x) / 2, y1 - name_offset, ANGLE_HORIZONTAL,
-                          GR_TEXT_H_ALIGN_CENTER, GR_TEXT_V_ALIGN_BOTTOM );
-            }
-        }
     else
     {
-            // Its a vertical line.
+        if( ( aPinOrient == PIN_ORIENTATION::PIN_LEFT ) || ( aPinOrient == PIN_ORIENTATION::PIN_RIGHT ) )
+        {
             if( aDrawPinName && aDrawPinNum )
             {
-                plotName( x1 - name_offset, ( y1 + aPinPos.y ) / 2, ANGLE_VERTICAL,
-                          GR_TEXT_H_ALIGN_CENTER, GR_TEXT_V_ALIGN_BOTTOM );
-
-                plotNum( x1 + num_offset, ( y1 + aPinPos.y ) / 2, ANGLE_VERTICAL,
-                          GR_TEXT_H_ALIGN_CENTER, GR_TEXT_V_ALIGN_TOP );
+                plotSimpleText( ( x1 + aPinPos.x ) / 2, y1 - name_offset, ANGLE_HORIZONTAL,
+                                GR_TEXT_H_ALIGN_CENTER, GR_TEXT_V_ALIGN_BOTTOM, name,
+                                GetNameTextSize(), namePenWidth, nameColor );
+                plotMultiLineWithBraces( ( x1 + aPinPos.x ) / 2, y1 + num_offset, false, true );
             }
             else if( aDrawPinName )
             {
-                plotName( x1 - name_offset, ( y1 + aPinPos.y ) / 2, ANGLE_VERTICAL,
-                          GR_TEXT_H_ALIGN_CENTER, GR_TEXT_V_ALIGN_BOTTOM );
+                plotSimpleText( ( x1 + aPinPos.x ) / 2, y1 - name_offset, ANGLE_HORIZONTAL,
+                                GR_TEXT_H_ALIGN_CENTER, GR_TEXT_V_ALIGN_BOTTOM, name,
+                                GetNameTextSize(), namePenWidth, nameColor );
             }
             else if( aDrawPinNum )
             {
-                plotNum( x1 - num_offset, ( y1 + aPinPos.y ) / 2, ANGLE_VERTICAL,
-                          GR_TEXT_H_ALIGN_CENTER, GR_TEXT_V_ALIGN_BOTTOM );
+                plotMultiLineWithBraces( ( x1 + aPinPos.x ) / 2, y1 - name_offset, false, true );
+            }
+        }
+        else
+        {
+            if( aDrawPinName && aDrawPinNum )
+            {
+                plotSimpleText( x1 - name_offset, ( y1 + aPinPos.y ) / 2, ANGLE_VERTICAL,
+                                GR_TEXT_H_ALIGN_CENTER, GR_TEXT_V_ALIGN_BOTTOM, name,
+                                GetNameTextSize(), namePenWidth, nameColor );
+                plotMultiLineWithBraces( x1 + num_offset, ( y1 + aPinPos.y ) / 2, true, true );
+            }
+            else if( aDrawPinName )
+            {
+                plotSimpleText( x1 - name_offset, ( y1 + aPinPos.y ) / 2, ANGLE_VERTICAL,
+                                GR_TEXT_H_ALIGN_CENTER, GR_TEXT_V_ALIGN_BOTTOM, name,
+                                GetNameTextSize(), namePenWidth, nameColor );
+            }
+            else if( aDrawPinNum )
+            {
+                plotMultiLineWithBraces( x1 - num_offset, ( y1 + aPinPos.y ) / 2, true, true );
             }
         }
     }
@@ -1256,6 +1441,14 @@ wxString SCH_PIN::GetDefaultNetName( const SCH_SHEET_PATH& aPath, bool aForceNoC
 
     wxString libPinShownName   = m_libPin ? m_libPin->GetShownName()   : wxString( "??" );
     wxString libPinShownNumber = m_libPin ? m_libPin->GetShownNumber() : wxString( "??" );
+    wxString effectivePadNumber = m_libPin ? m_libPin->GetEffectivePadNumber() : libPinShownNumber;
+
+    if( effectivePadNumber != libPinShownNumber )
+    {
+        wxLogTrace( "KICAD_STACKED_PINS",
+                    wxString::Format( "GetDefaultNetName: stacked pin shown='%s' -> using smallest logical='%s'",
+                                      libPinShownNumber, effectivePadNumber ) );
+    }
 
     // Use timestamp for unannotated symbols
     if( symbol->GetRef( &aPath, false ).Last() == '?' )
@@ -1263,6 +1456,10 @@ wxString SCH_PIN::GetDefaultNetName( const SCH_SHEET_PATH& aPath, bool aForceNoC
         name << GetParentSymbol()->m_Uuid.AsString();
 
         wxString libPinNumber = m_libPin ? m_libPin->GetNumber() : wxString( "??" );
+        // Apply same smallest-logical substitution for unannotated symbols
+        if( effectivePadNumber != libPinShownNumber && !effectivePadNumber.IsEmpty() )
+            libPinNumber = effectivePadNumber;
+
         name << "-Pad" << libPinNumber << ")";
         annotated = false;
     }
@@ -1274,7 +1471,10 @@ wxString SCH_PIN::GetDefaultNetName( const SCH_SHEET_PATH& aPath, bool aForceNoC
         name << "-" << EscapeString( libPinShownName, CTX_NETNAME );
 
         if( unconnected || has_multiple )
-            name << "-Pad" << EscapeString( libPinShownNumber, CTX_NETNAME );
+        {
+            // Use effective (possibly de-stacked) pad number in net name
+            name << "-Pad" << EscapeString( effectivePadNumber, CTX_NETNAME );
+        }
 
         name << ")";
     }
@@ -1282,7 +1482,7 @@ wxString SCH_PIN::GetDefaultNetName( const SCH_SHEET_PATH& aPath, bool aForceNoC
     {
         // Pin numbers are unique, so we skip the unit token
         name << symbol->GetRef( &aPath, false );
-        name << "-Pad" << EscapeString( libPinShownNumber, CTX_NETNAME ) << ")";
+        name << "-Pad" << EscapeString( effectivePadNumber, CTX_NETNAME ) << ")";
     }
 
     if( annotated )

eeschema/sch_pin.h

@@ -24,6 +24,7 @@
 #pragma once
 
 #include <memory>
+#include <vector>
 
 #include <pin_type.h>
 #include <sch_item.h>
@@ -122,6 +123,19 @@ public:
 
     const wxString& GetNumber() const { return m_number; }
     wxString GetShownNumber() const;
+    std::vector<wxString> GetStackedPinNumbers( bool* aValid = nullptr ) const;
+    /**
+     * Return the smallest logical pin number if this pin uses stacked
+     * notation and it is valid.  Otherwise returns std::nullopt.
+     */
+    std::optional<wxString> GetSmallestLogicalNumber() const;
+
+    /**
+     * Return the pin number to be used for deterministic operations such as
+     * auto‑generated net names.  For stacked pins this is the smallest logical
+     * number; otherwise it is the shown number.
+     */
+    wxString GetEffectivePadNumber() const;
     void SetNumber( const wxString& aNumber );
 
     int GetNameTextSize() const;

eeschema/sch_symbol.cpp

@@ -1128,7 +1128,7 @@ const SCH_PIN* SCH_SYMBOL::GetPin( const VECTOR2I& aPos ) const
 std::vector<SCH_PIN*> SCH_SYMBOL::GetLibPins() const
 {
     if( m_part )
-        return m_part->GetPins( m_unit, m_bodyStyle );
+    return m_part->GetGraphicalPins( m_unit, m_bodyStyle );
 
     return std::vector<SCH_PIN*>();
 }
@@ -2530,11 +2530,11 @@ void SCH_SYMBOL::Plot( PLOTTER* aPlotter, bool aBackground, const SCH_PLOT_OPTS&
 
     if( m_part )
     {
-        std::vector<SCH_PIN*> libPins = m_part->GetPins( GetUnit(), GetBodyStyle() );
+    std::vector<SCH_PIN*> libPins = m_part->GetGraphicalPins( GetUnit(), GetBodyStyle() );
 
         // Copy the source so we can re-orient and translate it.
         LIB_SYMBOL            tempSymbol( *m_part );
-        std::vector<SCH_PIN*> tempPins = tempSymbol.GetPins( GetUnit(), GetBodyStyle() );
+    std::vector<SCH_PIN*> tempPins = tempSymbol.GetGraphicalPins( GetUnit(), GetBodyStyle() );
 
         // Copy the pin info from the symbol to the temp pins
         for( unsigned i = 0; i < tempPins.size(); ++ i )
@@ -2652,11 +2652,11 @@ void SCH_SYMBOL::PlotPins( PLOTTER* aPlotter ) const
         TRANSFORM            savedTransform = renderSettings->m_Transform;
         renderSettings->m_Transform = GetTransform();
 
-        std::vector<SCH_PIN*> libPins = m_part->GetPins( GetUnit(), GetBodyStyle() );
+    std::vector<SCH_PIN*> libPins = m_part->GetGraphicalPins( GetUnit(), GetBodyStyle() );
 
         // Copy the source to stay const
         LIB_SYMBOL            tempSymbol( *m_part );
-        std::vector<SCH_PIN*> tempPins = tempSymbol.GetPins( GetUnit(), GetBodyStyle() );
+    std::vector<SCH_PIN*> tempPins = tempSymbol.GetGraphicalPins( GetUnit(), GetBodyStyle() );
         SCH_PLOT_OPTS         plotOpts;
 
         // Copy the pin info from the symbol to the temp pins

eeschema/tools/sch_actions.cpp

@@ -935,6 +935,20 @@ TOOL_ACTION SCH_ACTIONS::pinTable( TOOL_ACTION_ARGS()
         .Tooltip( _( "Displays pin table for bulk editing of pins" ) )
         .Icon( BITMAPS::pin_table ) );
 
+TOOL_ACTION SCH_ACTIONS::convertStackedPins( TOOL_ACTION_ARGS()
+        .Name( "eeschema.InteractiveEdit.convertStackedPins" )
+        .Scope( AS_GLOBAL )
+        .FriendlyName( _( "Convert Stacked Pins" ) )
+        .Tooltip( _( "Convert multiple pins at the same location to a single pin with stacked notation" ) )
+        .Icon( BITMAPS::pin ) );
+
+TOOL_ACTION SCH_ACTIONS::explodeStackedPin( TOOL_ACTION_ARGS()
+        .Name( "eeschema.InteractiveEdit.explodeStackedPin" )
+        .Scope( AS_GLOBAL )
+        .FriendlyName( _( "Explode Stacked Pin" ) )
+        .Tooltip( _( "Convert a pin with stacked notation to multiple individual pins" ) )
+        .Icon( BITMAPS::pin ) );
+
 TOOL_ACTION SCH_ACTIONS::breakWire( TOOL_ACTION_ARGS()
         .Name( "eeschema.InteractiveEdit.breakWire" )
         .Scope( AS_GLOBAL )

eeschema/tools/sch_actions.h

@@ -148,6 +148,8 @@ public:
     static TOOL_ACTION editSymbolLibraryLinks;
     static TOOL_ACTION symbolProperties;
     static TOOL_ACTION pinTable;
+    static TOOL_ACTION convertStackedPins;
+    static TOOL_ACTION explodeStackedPin;
     static TOOL_ACTION changeSymbols;
     static TOOL_ACTION updateSymbols;
     static TOOL_ACTION changeSymbol;

eeschema/tools/sch_point_editor.cpp

@@ -658,7 +658,7 @@ private:
                 {
                     std::vector<SCH_PIN*> pins;
 
-                    for( SCH_PIN* pin : aSymbol.GetPins( aUnit, 0 ) )
+                    for( SCH_PIN* pin : aSymbol.GetGraphicalPins( aUnit, 0 ) )
                     {
                         // Figure out if the pin "connects" to the line
                         const VECTOR2I pinRootPos = pin->GetPinRoot();

eeschema/tools/symbol_editor_edit_tool.cpp

@@ -99,6 +99,70 @@ bool SYMBOL_EDITOR_EDIT_TOOL::Init()
             SCH_TABLECELL_T,
     } );
 
+    const auto canConvertStackedPins =
+            [&]( const SELECTION& sel )
+            {
+                // If multiple pins are selected, check they are all at same location
+                if( sel.Size() >= 2 )
+                {
+                    std::vector<SCH_PIN*> pins;
+                    for( EDA_ITEM* item : sel )
+                    {
+                        if( item->Type() != SCH_PIN_T )
+                            return false;
+                        pins.push_back( static_cast<SCH_PIN*>( item ) );
+                    }
+
+                    // Check that all pins are at the same location
+                    VECTOR2I pos = pins[0]->GetPosition();
+                    for( size_t i = 1; i < pins.size(); ++i )
+                    {
+                        if( pins[i]->GetPosition() != pos )
+                            return false;
+                    }
+                    return true;
+                }
+
+                // If single pin is selected, check if there are other pins at same location
+                if( sel.Size() == 1 && sel.Front()->Type() == SCH_PIN_T )
+                {
+                    SCH_PIN* selectedPin = static_cast<SCH_PIN*>( sel.Front() );
+                    VECTOR2I pos = selectedPin->GetPosition();
+
+                    // Get the symbol and check for other pins at same location
+                    LIB_SYMBOL* symbol = m_frame->GetCurSymbol();
+                    if( !symbol )
+                        return false;
+
+                    int coLocatedCount = 0;
+
+                    for( SCH_PIN* pin : symbol->GetPins() )
+                    {
+                        if( pin->GetPosition() == pos )
+                        {
+                            coLocatedCount++;
+
+                            if( coLocatedCount >= 2 )
+                                return true;
+                        }
+                    }
+                }
+
+                return false;
+            };
+
+    const auto canExplodeStackedPin =
+            [&]( const SELECTION& sel )
+            {
+                if( sel.Size() != 1 || sel.Front()->Type() != SCH_PIN_T )
+                    return false;
+
+                SCH_PIN* pin = static_cast<SCH_PIN*>( sel.Front() );
+                bool isValid;
+                std::vector<wxString> stackedNumbers = pin->GetStackedPinNumbers( &isValid );
+                return isValid && stackedNumbers.size() > 1;
+            };
+
     // clang-format off
     // Add edit actions to the move tool menu
     if( moveTool )
@@ -148,6 +212,10 @@ bool SYMBOL_EDITOR_EDIT_TOOL::Init()
     selToolMenu.AddItem( SCH_ACTIONS::swap,         canEdit && SELECTION_CONDITIONS::MoreThan( 1 ), 200 );
     selToolMenu.AddItem( SCH_ACTIONS::properties,   canEdit && SCH_CONDITIONS::Count( 1 ), 200 );
 
+    selToolMenu.AddSeparator( 250 );
+    selToolMenu.AddItem( SCH_ACTIONS::convertStackedPins, canEdit && canConvertStackedPins, 250 );
+    selToolMenu.AddItem( SCH_ACTIONS::explodeStackedPin,  canEdit && canExplodeStackedPin, 250 );
+
     selToolMenu.AddSeparator( 300 );
     selToolMenu.AddItem( ACTIONS::cut,              SCH_CONDITIONS::IdleSelection, 300 );
     selToolMenu.AddItem( ACTIONS::copy,             SCH_CONDITIONS::IdleSelection, 300 );
@@ -712,6 +780,330 @@ int SYMBOL_EDITOR_EDIT_TOOL::PinTable( const TOOL_EVENT& aEvent )
 }
 
 
+int SYMBOL_EDITOR_EDIT_TOOL::ConvertStackedPins( const TOOL_EVENT& aEvent )
+{
+    SCH_COMMIT  commit( m_frame );
+    LIB_SYMBOL* symbol = m_frame->GetCurSymbol();
+
+    if( !symbol )
+        return 0;
+
+    SCH_SELECTION_TOOL* selTool = m_toolMgr->GetTool<SCH_SELECTION_TOOL>();
+    wxCHECK( selTool, -1 );
+
+    SCH_SELECTION& selection = selTool->GetSelection();
+
+    // Collect pins to convert - accept pins with any number format
+    std::vector<SCH_PIN*> pinsToConvert;
+
+    if( selection.Size() == 1 && selection.Front()->Type() == SCH_PIN_T )
+    {
+        // Single pin selected - find all pins at the same location
+        SCH_PIN* selectedPin = static_cast<SCH_PIN*>( selection.Front() );
+        VECTOR2I pos = selectedPin->GetPosition();
+
+        for( SCH_PIN* pin : symbol->GetPins() )
+        {
+            if( pin->GetPosition() == pos )
+                pinsToConvert.push_back( pin );
+        }
+    }
+    else
+    {
+        // Multiple pins selected - use them directly, accepting any pin numbers
+        for( EDA_ITEM* item : selection )
+        {
+            if( item->Type() == SCH_PIN_T )
+                pinsToConvert.push_back( static_cast<SCH_PIN*>( item ) );
+        }
+    }
+
+    if( pinsToConvert.size() < 2 )
+    {
+        m_frame->ShowInfoBarError( _( "At least two pins are needed to convert to stacked pins" ) );
+        return 0;
+    }
+
+    // Check that all pins are at the same location
+    VECTOR2I pos = pinsToConvert[0]->GetPosition();
+    for( size_t i = 1; i < pinsToConvert.size(); ++i )
+    {
+        if( pinsToConvert[i]->GetPosition() != pos )
+        {
+            m_frame->ShowInfoBarError( _( "All pins must be at the same location" ) );
+            return 0;
+        }
+    }
+
+    commit.Modify( symbol, m_frame->GetScreen() );
+
+    // Clear selection before modifying pins, like the Delete command does
+    m_toolMgr->RunAction( ACTIONS::selectionClear );
+
+    // Sort pins for consistent ordering - handle arbitrary pin number formats
+    std::sort( pinsToConvert.begin(), pinsToConvert.end(),
+        []( SCH_PIN* a, SCH_PIN* b )
+        {
+            wxString numA = a->GetNumber();
+            wxString numB = b->GetNumber();
+
+            // Try to convert to integers for proper numeric sorting
+            long longA, longB;
+            bool aIsNumeric = numA.ToLong( &longA );
+            bool bIsNumeric = numB.ToLong( &longB );
+
+            // Both are purely numeric - sort numerically
+            if( aIsNumeric && bIsNumeric )
+                return longA < longB;
+
+            // Mixed numeric/non-numeric - numeric pins come first
+            if( aIsNumeric && !bIsNumeric )
+                return true;
+            if( !aIsNumeric && bIsNumeric )
+                return false;
+
+            // Both non-numeric or mixed alphanumeric - use lexicographic sorting
+            return numA < numB;
+        });
+
+    // Build the stacked notation string with range collapsing
+    wxString stackedNotation = wxT("[");
+
+    // Helper function to collapse consecutive numbers into ranges - handles arbitrary pin formats
+    auto collapseRanges = [&]() -> wxString
+    {
+        if( pinsToConvert.empty() )
+            return wxT("");
+
+        wxString result;
+
+        // Group pins by their alphanumeric prefix for range collapsing
+        std::map<wxString, std::vector<long>> prefixGroups;
+        std::vector<wxString> nonNumericPins;
+
+        // Parse each pin number to separate prefix from numeric suffix
+        for( SCH_PIN* pin : pinsToConvert )
+        {
+            wxString pinNumber = pin->GetNumber();
+
+            // Skip empty pin numbers (shouldn't happen, but be defensive)
+            if( pinNumber.IsEmpty() )
+            {
+                nonNumericPins.push_back( wxT("(empty)") );
+                continue;
+            }
+
+            wxString prefix;
+            wxString numericPart;
+
+            // Find where numeric part starts (scan from end)
+            size_t numStart = pinNumber.length();
+            for( int i = pinNumber.length() - 1; i >= 0; i-- )
+            {
+                if( !wxIsdigit( pinNumber[i] ) )
+                {
+                    numStart = i + 1;
+                    break;
+                }
+                if( i == 0 )  // All digits
+                    numStart = 0;
+            }
+
+            if( numStart < pinNumber.length() )  // Has numeric suffix
+            {
+                prefix = pinNumber.Left( numStart );
+                numericPart = pinNumber.Mid( numStart );
+
+                long numValue;
+                if( numericPart.ToLong( &numValue ) && numValue >= 0 )  // Valid non-negative number
+                {
+                    prefixGroups[prefix].push_back( numValue );
+                }
+                else
+                {
+                    // Numeric part couldn't be parsed or is negative - treat as non-numeric
+                    nonNumericPins.push_back( pinNumber );
+                }
+            }
+            else  // No numeric suffix - consolidate as individual value
+            {
+                nonNumericPins.push_back( pinNumber );
+            }
+        }
+
+        // Process each prefix group
+        for( auto& [prefix, numbers] : prefixGroups )
+        {
+            if( !result.IsEmpty() )
+                result += wxT(",");
+
+            // Sort numeric values for this prefix
+            std::sort( numbers.begin(), numbers.end() );
+
+            // Collapse consecutive ranges within this prefix
+            size_t i = 0;
+            while( i < numbers.size() )
+            {
+                if( i > 0 )  // Not first number in this prefix group
+                    result += wxT(",");
+
+                long start = numbers[i];
+                long end = start;
+
+                // Find the end of consecutive sequence
+                while( i + 1 < numbers.size() && numbers[i + 1] == numbers[i] + 1 )
+                {
+                    i++;
+                    end = numbers[i];
+                }
+
+                // Add range or single number with prefix
+                if( end > start + 1 )  // Range of 3+ numbers
+                    result += wxString::Format( wxT("%s%ld-%s%ld"), prefix, start, prefix, end );
+                else if( end == start + 1 )  // Two consecutive numbers
+                    result += wxString::Format( wxT("%s%ld,%s%ld"), prefix, start, prefix, end );
+                else  // Single number
+                    result += wxString::Format( wxT("%s%ld"), prefix, start );
+
+                i++;
+            }
+        }
+
+        // Add non-numeric pin numbers as individual comma-separated values
+        for( const wxString& nonNum : nonNumericPins )
+        {
+            if( !result.IsEmpty() )
+                result += wxT(",");
+            result += nonNum;
+        }
+
+        return result;
+    };
+
+    stackedNotation += collapseRanges();
+    stackedNotation += wxT("]");
+
+    // Keep the first pin and give it the stacked notation
+    SCH_PIN* masterPin = pinsToConvert[0];
+    masterPin->SetNumber( stackedNotation );
+
+    // Log information about pins being removed before we remove them
+    wxLogTrace( "KICAD_STACKED_PINS",
+               wxString::Format( "Converting %zu pins to stacked notation '%s'",
+                               pinsToConvert.size(), stackedNotation ) );
+
+    // Remove all other pins from the symbol that were consolidated into the stacked notation
+    // Collect pins to remove first, then remove them all at once like the Delete command
+    std::vector<SCH_PIN*> pinsToRemove;
+    for( size_t i = 1; i < pinsToConvert.size(); ++i )
+    {
+        SCH_PIN* pinToRemove = pinsToConvert[i];
+
+        // Log the pin before removing it
+        wxLogTrace( "KICAD_STACKED_PINS",
+                   wxString::Format( "Will remove pin '%s' at position (%d, %d)",
+                                   pinToRemove->GetNumber(),
+                                   pinToRemove->GetPosition().x,
+                                   pinToRemove->GetPosition().y ) );
+
+        pinsToRemove.push_back( pinToRemove );
+    }
+
+    // Remove all pins at once, like the Delete command does
+    for( SCH_PIN* pin : pinsToRemove )
+    {
+        symbol->RemoveDrawItem( pin );
+    }
+
+    commit.Push( wxString::Format( _( "Convert %zu Stacked Pins to '%s'" ),
+                                  pinsToConvert.size(), stackedNotation ) );
+    m_frame->RebuildView();
+    return 0;
+}
+
+
+int SYMBOL_EDITOR_EDIT_TOOL::ExplodeStackedPin( const TOOL_EVENT& aEvent )
+{
+    SCH_COMMIT  commit( m_frame );
+    LIB_SYMBOL* symbol = m_frame->GetCurSymbol();
+
+    if( !symbol )
+        return 0;
+
+    SCH_SELECTION_TOOL* selTool = m_toolMgr->GetTool<SCH_SELECTION_TOOL>();
+    wxCHECK( selTool, -1 );
+
+    SCH_SELECTION& selection = selTool->GetSelection();
+
+    if( selection.GetSize() != 1 || selection.Front()->Type() != SCH_PIN_T )
+    {
+        m_frame->ShowInfoBarError( _( "Select a single pin with stacked notation to explode" ) );
+        return 0;
+    }
+
+    SCH_PIN* pin = static_cast<SCH_PIN*>( selection.Front() );
+
+    // Check if the pin has stacked notation
+    bool isValid;
+    std::vector<wxString> stackedNumbers = pin->GetStackedPinNumbers( &isValid );
+
+    if( !isValid || stackedNumbers.size() <= 1 )
+    {
+        m_frame->ShowInfoBarError( _( "Selected pin does not have valid stacked notation" ) );
+        return 0;
+    }
+
+    commit.Modify( symbol, m_frame->GetScreen() );
+
+    // Clear selection before modifying pins
+    m_toolMgr->RunAction( ACTIONS::selectionClear );
+
+    // Sort the stacked numbers to find the smallest one
+    std::sort( stackedNumbers.begin(), stackedNumbers.end(),
+        []( const wxString& a, const wxString& b )
+        {
+            // Try to convert to integers for proper numeric sorting
+            long numA, numB;
+            if( a.ToLong( &numA ) && b.ToLong( &numB ) )
+                return numA < numB;
+
+            // Fall back to string comparison if not numeric
+            return a < b;
+        });
+
+    // Change the original pin to use the first (smallest) number and make it visible
+    pin->SetNumber( stackedNumbers[0] );
+    pin->SetVisible( true );
+
+    // Create additional pins for the remaining numbers and make them invisible
+    for( size_t i = 1; i < stackedNumbers.size(); ++i )
+    {
+        SCH_PIN* newPin = new SCH_PIN( symbol );
+
+        // Copy all properties from the original pin
+        newPin->SetPosition( pin->GetPosition() );
+        newPin->SetOrientation( pin->GetOrientation() );
+        newPin->SetShape( pin->GetShape() );
+        newPin->SetLength( pin->GetLength() );
+        newPin->SetType( pin->GetType() );
+        newPin->SetName( pin->GetName() );
+        newPin->SetNumber( stackedNumbers[i] );
+        newPin->SetNameTextSize( pin->GetNameTextSize() );
+        newPin->SetNumberTextSize( pin->GetNumberTextSize() );
+        newPin->SetUnit( pin->GetUnit() );
+        newPin->SetBodyStyle( pin->GetBodyStyle() );
+        newPin->SetVisible( false );  // Make all other pins invisible
+
+        // Add the new pin to the symbol
+        symbol->AddDrawItem( newPin );
+    }
+
+    commit.Push( _( "Explode Stacked Pin" ) );
+    m_frame->RebuildView();
+    return 0;
+}
+
+
 int SYMBOL_EDITOR_EDIT_TOOL::UpdateSymbolFields( const TOOL_EVENT& aEvent )
 {
     LIB_SYMBOL* symbol = m_frame->GetCurSymbol();
@@ -1021,6 +1413,8 @@ void SYMBOL_EDITOR_EDIT_TOOL::setTransitions()
     Go( &SYMBOL_EDITOR_EDIT_TOOL::Properties,         SCH_ACTIONS::properties.MakeEvent() );
     Go( &SYMBOL_EDITOR_EDIT_TOOL::Properties,         SCH_ACTIONS::symbolProperties.MakeEvent() );
     Go( &SYMBOL_EDITOR_EDIT_TOOL::PinTable,           SCH_ACTIONS::pinTable.MakeEvent() );
+    Go( &SYMBOL_EDITOR_EDIT_TOOL::ConvertStackedPins, SCH_ACTIONS::convertStackedPins.MakeEvent() );
+    Go( &SYMBOL_EDITOR_EDIT_TOOL::ExplodeStackedPin,  SCH_ACTIONS::explodeStackedPin.MakeEvent() );
     Go( &SYMBOL_EDITOR_EDIT_TOOL::UpdateSymbolFields, SCH_ACTIONS::updateSymbolFields.MakeEvent() );
     // clang-format on
 }

eeschema/tools/symbol_editor_edit_tool.h

@@ -49,6 +49,8 @@ public:
 
     int Properties( const TOOL_EVENT& aEvent );
     int PinTable( const TOOL_EVENT& aEvent );
+    int ConvertStackedPins( const TOOL_EVENT& aEvent );
+    int ExplodeStackedPin( const TOOL_EVENT& aEvent );
     int UpdateSymbolFields( const TOOL_EVENT& aEvent );
 
     int Undo( const TOOL_EVENT& aEvent );

eeschema/widgets/panel_symbol_chooser.cpp

@@ -632,7 +632,7 @@ void PANEL_SYMBOL_CHOOSER::populateFootprintSelector( LIB_ID const& aLibId )
 
     if( symbol != nullptr )
     {
-        int        pinCount = symbol->GetPins( 0 /* all units */, 1 /* single bodyStyle */ ).size();
+    int        pinCount = symbol->GetGraphicalPins( 0 /* all units */, 1 /* single bodyStyle */ ).size();
         SCH_FIELD* fp_field = symbol->GetField( FIELD_T::FOOTPRINT );
         wxString   fp_name = fp_field ? fp_field->GetFullText() : wxString( "" );
 

include/string_utils.h

@@ -476,5 +476,23 @@ KICOMMON_API wxString  From_UTF8( const char* cstring );
  */
 KICOMMON_API wxString NormalizeFileUri( const wxString& aFileUri );
 
+/**
+ * Expand stacked pin notation like [1,2,3], [1-4], [A1-A4], or [AA1-AA3,AB4,CD12-CD14]
+ * into individual pin numbers, supporting both numeric and alphanumeric pin prefixes.
+ *
+ * Examples:
+ *   "[1,2,3]" -> {"1", "2", "3"}
+ *   "[1-4]" -> {"1", "2", "3", "4"}
+ *   "[A1-A3]" -> {"A1", "A2", "A3"}
+ *   "[AA1-AA3,AB4]" -> {"AA1", "AA2", "AA3", "AB4"}
+ *   "5" -> {"5"} (non-bracketed pins returned as-is)
+ *
+ * @param aPinName is the pin name to expand (may or may not use stacked notation)
+ * @param aValid is optionally set to indicate whether the notation was valid
+ * @return vector of individual pin numbers
+ */
+KICOMMON_API std::vector<wxString> ExpandStackedPinNotation( const wxString& aPinName,
+                                                            bool* aValid = nullptr );
+
 
 #endif  // STRING_UTILS_H

pcbnew/footprint_chooser_frame.cpp

@@ -469,6 +469,8 @@ void FOOTPRINT_CHOOSER_FRAME::KiwayMailIn( KIWAY_EXPRESS& mail )
     {
     case MAIL_SYMBOL_NETLIST:
     {
+    wxLogTrace( "FOOTPRINT_CHOOSER", wxS( "MAIL_SYMBOL_NETLIST received: size=%zu" ),
+            payload.size() );
         wxSizer*  filtersSizer = m_chooserPanel->GetFiltersSizer();
         wxWindow* filtersWindow = filtersSizer->GetContainingWindow();
         wxString  msg;
@@ -486,10 +488,24 @@ void FOOTPRINT_CHOOSER_FRAME::KiwayMailIn( KIWAY_EXPRESS& mail )
 
         if( strings.size() >= 1 && !strings[0].empty() )
         {
-            for( const wxString& pin : wxSplit( strings[0], '\t' ) )
+            wxArrayString tokens = wxSplit( strings[0], '\t' );
+
+            wxLogTrace( "FOOTPRINT_CHOOSER", wxS( "First line entries=%u" ), (unsigned) tokens.size() );
+
+            for( const wxString& pin : tokens )
                 pinNames[ pin.BeforeFirst( ' ' ) ] = pin.AfterFirst( ' ' );
 
             m_pinCount = (int) pinNames.size();
+
+            wxString pinList;
+            for( const auto& kv : pinNames )
+            {
+                if( !pinList.IsEmpty() )
+                    pinList << wxS( "," );
+                pinList << kv.first;
+            }
+
+            wxLogTrace( "FOOTPRINT_CHOOSER", wxS( "Parsed pins=%d -> [%s]" ), m_pinCount, pinList );
         }
 
         if( strings.size() >= 2 && !strings[1].empty() )
@@ -532,6 +548,7 @@ void FOOTPRINT_CHOOSER_FRAME::KiwayMailIn( KIWAY_EXPRESS& mail )
         if( m_pinCount > 0 )
         {
             msg.Printf( _( "Filter by pin count (%d)" ), m_pinCount );
+            wxLogTrace( "FOOTPRINT_CHOOSER", wxS( "Pin-count label: %s" ), msg );
 
             if( !m_filterByPinCount )
             {
@@ -558,6 +575,8 @@ void FOOTPRINT_CHOOSER_FRAME::KiwayMailIn( KIWAY_EXPRESS& mail )
         }
 
     m_chooserPanel->GetViewerPanel()->SetPinFunctions( pinNames );
+    wxLogTrace( "FOOTPRINT_CHOOSER", wxS( "SetPinFunctions called with %zu entries" ),
+            pinNames.size() );
 
         // Save the wxFormBuilder size of the dialog...
         if( s_dialogRect.GetSize().x == 0 || s_dialogRect.GetSize().y == 0 )

pcbnew/netlist_reader/board_netlist_updater.cpp

@@ -45,6 +45,7 @@
 #include <netlist_reader/pcb_netlist.h>
 #include <connectivity/connectivity_data.h>
 #include <reporter.h>
+#include <wx/log.h>
 
 #include "board_netlist_updater.h"
 
@@ -965,14 +966,28 @@ bool BOARD_NETLIST_UPDATER::updateComponentPadConnections( FOOTPRINT* aFootprint
     {
         const COMPONENT_NET& net = aNewComponent->GetNet( pad->GetNumber() );
 
+        wxLogTrace( wxT( "NETLIST_UPDATE" ),
+                    wxT( "Processing pad %s of component %s" ),
+                    pad->GetNumber(),
+                    aNewComponent->GetReference() );
+
         wxString pinFunction;
         wxString pinType;
 
         if( net.IsValid() )     // i.e. the pad has a name
         {
+            wxLogTrace( wxT( "NETLIST_UPDATE" ),
+                        wxT( "  Found valid net: %s" ),
+                        net.GetNetName() );
             pinFunction = net.GetPinFunction();
             pinType = net.GetPinType();
         }
+        else
+        {
+            wxLogTrace( wxT( "NETLIST_UPDATE" ),
+                        wxT( "  No net found for pad %s" ),
+                        pad->GetNumber() );
+        }
 
         if( !m_isDryRun )
         {

pcbnew/netlist_reader/kicad_netlist_reader.cpp

@@ -104,6 +104,7 @@ void KICAD_NETLIST_PARSER::Parse()
             break;
 
         case T_components:  // The section comp starts here.
+            wxLogTrace( "CVPCB_PINCOUNT", wxT( "Parse: entering components section" ) );
             while( ( token = NextTok() ) != T_EOF )
             {
                 if( token == T_RIGHT )
@@ -132,6 +133,7 @@ void KICAD_NETLIST_PARSER::Parse()
             break;
 
         case T_nets:    // The section nets starts here.
+            wxLogTrace( "CVPCB_PINCOUNT", wxT( "Parse: entering nets section" ) );
             while( ( token = NextTok() ) != T_EOF )
             {
                 if( token == T_RIGHT )
@@ -146,6 +148,7 @@ void KICAD_NETLIST_PARSER::Parse()
             break;
 
         case T_libparts:    // The section libparts starts here.
+            wxLogTrace( "CVPCB_PINCOUNT", wxT( "Parse: entering libparts section" ) );
             while( ( token = NextTok() ) != T_EOF )
             {
                 if( token == T_RIGHT )
@@ -384,6 +387,8 @@ void KICAD_NETLIST_PARSER::parseComponent()
                     Expecting( "part, lib or description" );
                 }
             }
+            wxLogTrace( "CVPCB_PINCOUNT", wxT( "parseComponent: ref='%s' libsource='%s:%s'" ),
+                        ref, library, name );
             break;
 
         case T_property:
@@ -714,6 +719,7 @@ void KICAD_NETLIST_PARSER::parseLibPartList()
     int               pinCount = 0;
 
     // The last token read was libpart, so read the next token
+    wxLogTrace( "CVPCB_PINCOUNT", wxT( "parseLibPartList: begin libpart" ) );
     while( (token = NextTok() ) != T_RIGHT )
     {
         if( token == T_LEFT )
@@ -773,6 +779,8 @@ void KICAD_NETLIST_PARSER::parseLibPartList()
             break;
 
         case T_pins:
+            wxLogTrace( "CVPCB_PINCOUNT", wxT( "parseLibPartList: entering pins for '%s:%s'" ),
+                        libName, libPartName );
             while( (token = NextTok() ) != T_RIGHT )
             {
                 if( token == T_LEFT )
@@ -782,9 +790,13 @@ void KICAD_NETLIST_PARSER::parseLibPartList()
                     Expecting( T_pin );
 
                 pinCount++;
+                wxLogTrace( "CVPCB_PINCOUNT", wxT( "parseLibPartList: pin #%d for '%s:%s'" ),
+                            pinCount, libName, libPartName );
 
                 skipCurrent();
             }
+            wxLogTrace( "CVPCB_PINCOUNT", wxT( "Parsed libpart '%s:%s' pins => pinCount=%d" ),
+                        libName, libPartName, pinCount );
             break;
 
         default:
@@ -795,6 +807,8 @@ void KICAD_NETLIST_PARSER::parseLibPartList()
     }
 
     // Find all of the components that reference this component library part definition.
+    wxLogTrace( "CVPCB_PINCOUNT", wxT( "parseLibPartList: assigning pinCount=%d for libpart '%s:%s'" ),
+                pinCount, libName, libPartName );
     for( unsigned i = 0;  i < m_netlist->GetCount();  i++ )
     {
         component = m_netlist->GetComponent( i );
@@ -803,6 +817,8 @@ void KICAD_NETLIST_PARSER::parseLibPartList()
         {
             component->SetFootprintFilters( footprintFilters );
             component->SetPinCount( pinCount );
+            wxLogTrace( "CVPCB_PINCOUNT", wxT( "Assign pinCount=%d to component ref='%s' part='%s:%s'" ),
+                        pinCount, component->GetReference(), libName, libPartName );
         }
 
         for( unsigned jj = 0; jj < aliases.GetCount(); jj++ )
@@ -811,6 +827,9 @@ void KICAD_NETLIST_PARSER::parseLibPartList()
             {
                 component->SetFootprintFilters( footprintFilters );
                 component->SetPinCount( pinCount );
+                wxLogTrace( "CVPCB_PINCOUNT",
+                            wxT( "Assign pinCount=%d to component ref='%s' via alias='%s:%s'" ),
+                            pinCount, component->GetReference(), libName, aliases[jj] );
             }
         }
 

pcbnew/netlist_reader/pcb_netlist.cpp

@@ -29,6 +29,8 @@
 #include <footprint.h>
 #include <richio.h>
 #include <string_utils.h>
+#include <wx/tokenzr.h>
+#include <wx/log.h>
 
 
 int COMPONENT_NET::Format( OUTPUTFORMATTER* aOut, int aNestLevel, int aCtl )
@@ -60,14 +62,56 @@ void COMPONENT::SetFootprint( FOOTPRINT* aFootprint )
 COMPONENT_NET COMPONENT::m_emptyNet;
 
 
+
+
+
 const COMPONENT_NET& COMPONENT::GetNet( const wxString& aPinName ) const
 {
+    wxLogTrace( wxT( "NETLIST_STACKED_PINS" ),
+                wxT( "Looking for pin '%s' in component '%s'" ),
+                aPinName, m_reference );
+
     for( const COMPONENT_NET& net : m_nets )
     {
+        wxLogTrace( wxT( "NETLIST_STACKED_PINS" ),
+                    wxT( "  Checking net pin name '%s'" ),
+                    net.GetPinName() );
+
         if( net.GetPinName() == aPinName )
+        {
+            wxLogTrace( wxT( "NETLIST_STACKED_PINS" ),
+                        wxT( "  Found exact match for pin '%s'" ),
+                        aPinName );
             return net;
         }
 
+        // Check if this net's pin name is a stacked pin notation that expands to include aPinName
+        std::vector<wxString> expandedPins = ExpandStackedPinNotation( net.GetPinName() );
+        if( !expandedPins.empty() )
+        {
+            wxLogTrace( wxT( "NETLIST_STACKED_PINS" ),
+                        wxT( "  Pin name '%s' expanded to %zu pins" ),
+                        net.GetPinName(), expandedPins.size() );
+
+            for( const wxString& expandedPin : expandedPins )
+            {
+                wxLogTrace( wxT( "NETLIST_STACKED_PINS" ),
+                            wxT( "    Checking expanded pin '%s'" ),
+                            expandedPin );
+                if( expandedPin == aPinName )
+                {
+                    wxLogTrace( wxT( "NETLIST_STACKED_PINS" ),
+                                wxT( "  Found match for pin '%s' in stacked notation '%s'" ),
+                                aPinName, net.GetPinName() );
+                    return net;
+                }
+            }
+        }
+    }
+
+    wxLogTrace( wxT( "NETLIST_STACKED_PINS" ),
+                wxT( "  No net found for pin '%s'" ),
+                aPinName );
     return m_emptyNet;
 }
 

qa/data/eeschema/stacked_pin_nomenclature.kicad_sch

@@ -0,0 +1,128 @@
+(kicad_sch (version 20240910) (generator eeschema)
+
+  (paper "A4")
+
+  (lib_symbols
+    (symbol "Device:R"
+      (pin_names (offset 0))
+      (exclude_from_sim no)
+      (in_bom yes)
+      (on_board yes)
+      (duplicate_pin_numbers_are_jumpers no)
+      (property "Reference" "R1" (at 6.35 0 90)
+        (effects (font (size 1.27 1.27))) )
+      (property "Value" "R" (at 3.81 0 90)
+        (effects (font (size 1.27 1.27))) )
+      (property "Footprint" "" (at -1.778 0 90) (hide yes)
+        (effects (font (size 1.27 1.27))) )
+      (property "Datasheet" "" (at 0 0 0) (hide yes)
+        (effects (font (size 1.27 1.27))) )
+      (property "Description" "Resistor" (at 0 0 0) (hide yes)
+        (effects (font (size 1.27 1.27))) )
+      (property "ki_keywords" "R res resistor" (at 0 0 0) (hide yes)
+        (effects (font (size 1.27 1.27))) )
+      (property "ki_fp_filters" "R_*" (at 0 0 0) (hide yes)
+        (effects (font (size 1.27 1.27))) )
+      (symbol "R_0_1"
+        (rectangle (start -1.016 -2.54) (end 1.016 2.54)
+          (stroke (width 0.254) (type default)) (fill (type none)) ) )
+      (symbol "R_1_1"
+        (pin passive line (at 0 6.35 270) (length 1.27)
+          (name "" (effects (font (size 1.27 1.27))))
+          (number "[1-5]" (effects (font (size 1.27 1.27)))) )
+        (pin passive line (at 0 -8.636 90) (length 1.27)
+          (name "" (effects (font (size 1.27 1.27))))
+          (number "[6,7,9-11]" (effects (font (size 1.27 1.27)))) ) ) )
+
+    (symbol "power:GND"
+      (power global)
+      (pin_numbers (hide yes))
+      (pin_names (offset 0) (hide yes))
+      (exclude_from_sim no) (in_bom yes) (on_board yes)
+      (duplicate_pin_numbers_are_jumpers no)
+      (property "Reference" "#PWR" (at 0 -6.35 0) (hide yes)
+        (effects (font (size 1.27 1.27))) )
+      (property "Value" "GND" (at 0 -3.81 0)
+        (effects (font (size 1.27 1.27))) )
+      (property "Footprint" "" (at 0 0 0) (hide yes)
+        (effects (font (size 1.27 1.27))) )
+      (property "Datasheet" "" (at 0 0 0) (hide yes)
+        (effects (font (size 1.27 1.27))) )
+      (property "Description" "Power symbol creates a global label with name \"GND\" , ground"
+        (at 0 0 0) (hide yes) (effects (font (size 1.27 1.27))) )
+      (property "ki_keywords" "global power" (at 0 0 0) (hide yes)
+        (effects (font (size 1.27 1.27))) )
+      (symbol "GND_0_1"
+        (polyline (pts (xy 0 0) (xy 0 -1.27) (xy 1.27 -1.27) (xy 0 -2.54) (xy -1.27 -1.27) (xy 0 -1.27))
+          (stroke (width 0) (type default)) (fill (type none)) ) )
+      (symbol "GND_1_1"
+        (pin power_in line (at 0 0 270) (length 0)
+          (name "" (effects (font (size 1.27 1.27))))
+          (number "1" (effects (font (size 1.27 1.27)))) ) ) )
+
+    (symbol "power:VCC"
+      (power global)
+      (pin_numbers (hide yes))
+      (pin_names (offset 0) (hide yes))
+      (exclude_from_sim no) (in_bom yes) (on_board yes)
+      (duplicate_pin_numbers_are_jumpers no)
+      (property "Reference" "#PWR" (at 0 -3.81 0) (hide yes)
+        (effects (font (size 1.27 1.27))) )
+      (property "Value" "VCC" (at 0 3.556 0)
+        (effects (font (size 1.27 1.27))) )
+      (property "Footprint" "" (at 0 0 0) (hide yes)
+        (effects (font (size 1.27 1.27))) )
+      (property "Datasheet" "" (at 0 0 0) (hide yes)
+        (effects (font (size 1.27 1.27))) )
+      (property "Description" "Power symbol creates a global label with name \"VCC\""
+        (at 0 0 0) (hide yes) (effects (font (size 1.27 1.27))) )
+      (property "ki_keywords" "global power" (at 0 0 0) (hide yes)
+        (effects (font (size 1.27 1.27))) )
+      (symbol "VCC_0_1"
+        (polyline (pts (xy -0.762 1.27) (xy 0 2.54)) (stroke (width 0) (type default)) (fill (type none)))
+        (polyline (pts (xy 0 2.54) (xy 0.762 1.27)) (stroke (width 0) (type default)) (fill (type none)))
+        (polyline (pts (xy 0 0) (xy 0 2.54)) (stroke (width 0) (type default)) (fill (type none))) )
+      (symbol "VCC_1_1"
+        (pin power_in line (at 0 0 90) (length 0)
+          (name "" (effects (font (size 1.27 1.27))))
+          (number "1" (effects (font (size 1.27 1.27)))) ) ) )
+  )
+
+  (wire (pts (xy 134.62 83.82) (xy 134.62 76.2)) (stroke (width 0) (type default)))
+  (wire (pts (xy 100.33 87.63) (xy 100.33 83.82)) (stroke (width 0) (type default)))
+  (wire (pts (xy 100.33 83.82) (xy 109.22 83.82)) (stroke (width 0) (type default)))
+  (wire (pts (xy 124.206 83.82) (xy 134.62 83.82)) (stroke (width 0) (type default)))
+
+  (symbol (lib_id "Device:R") (at 115.57 83.82 90) (unit 1) (body_style 1)
+    (exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced yes)
+    (uuid "2166cf4e-5b03-495b-af0a-be2718b61b04")
+    (property "Reference" "R1" (at 115.57 77.47 90) (effects (font (size 1.27 1.27))))
+    (property "Value" "R" (at 115.57 80.01 90) (effects (font (size 1.27 1.27))))
+    (property "Footprint" "" (at 115.57 85.598 90) (hide yes) (effects (font (size 1.27 1.27))))
+    (property "Datasheet" "" (at 115.57 83.82 0) (hide yes) (effects (font (size 1.27 1.27))))
+    (property "Description" "Resistor" (at 115.57 83.82 0) (hide yes) (effects (font (size 1.27 1.27))))
+    (pin "[6,7,9-11]" (uuid "f62cbf3f-56f0-413b-a710-93a48027efbb"))
+    (pin "[1-5]" (uuid "e856ce98-c7c6-4066-97a8-60e95541ae81")) )
+
+  (symbol (lib_id "power:VCC") (at 134.62 76.2 0) (unit 1) (body_style 1)
+    (exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced yes)
+    (uuid "2b72c13a-dfcb-4980-a25b-daac640cdb9b")
+    (property "Reference" "#PWR01" (at 134.62 80.01 0) (hide yes) (effects (font (size 1.27 1.27))))
+    (property "Value" "VCC" (at 134.62 71.12 0) (effects (font (size 1.27 1.27))))
+    (property "Footprint" "" (at 134.62 76.2 0) (hide yes) (effects (font (size 1.27 1.27))))
+    (property "Datasheet" "" (at 134.62 76.2 0) (hide yes) (effects (font (size 1.27 1.27))))
+    (property "Description" "Power symbol creates a global label with name \"VCC\""
+      (at 134.62 76.2 0) (hide yes) (effects (font (size 1.27 1.27))))
+    (pin "1" (uuid "ff7185fb-347f-48f5-bcf0-de5808edd725")) )
+
+  (symbol (lib_id "power:GND") (at 100.33 87.63 0) (unit 1) (body_style 1)
+    (exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced yes)
+    (uuid "4e64c428-4aed-4183-826f-2fa5009f4177")
+    (property "Reference" "#PWR02" (at 100.33 93.98 0) (hide yes) (effects (font (size 1.27 1.27))))
+    (property "Value" "GND" (at 100.33 92.71 0) (effects (font (size 1.27 1.27))))
+    (property "Footprint" "" (at 100.33 87.63 0) (hide yes) (effects (font (size 1.27 1.27))))
+    (property "Datasheet" "" (at 100.33 87.63 0) (hide yes) (effects (font (size 1.27 1.27))))
+    (property "Description" "Power symbol creates a global label with name \"GND\" , ground"
+      (at 100.33 87.63 0) (hide yes) (effects (font (size 1.27 1.27))))
+    (pin "1" (uuid "b8c00030-efa1-4421-9af4-303142b1c17d")) )
+)

qa/data/pcbnew/stacked/stacked.kicad_pcb

@@ -0,0 +1,872 @@
+(kicad_pcb
+	(version 20250901)
+	(generator "pcbnew")
+	(generator_version "9.99")
+	(general
+		(thickness 1.6)
+		(legacy_teardrops no)
+	)
+	(paper "A4")
+	(layers
+		(0 "F.Cu" signal)
+		(2 "B.Cu" signal)
+		(9 "F.Adhes" user "F.Adhesive")
+		(11 "B.Adhes" user "B.Adhesive")
+		(13 "F.Paste" user)
+		(15 "B.Paste" user)
+		(5 "F.SilkS" user "F.Silkscreen")
+		(7 "B.SilkS" user "B.Silkscreen")
+		(1 "F.Mask" user)
+		(3 "B.Mask" user)
+		(17 "Dwgs.User" user "User.Drawings")
+		(19 "Cmts.User" user "User.Comments")
+		(21 "Eco1.User" user "User.Eco1")
+		(23 "Eco2.User" user "User.Eco2")
+		(25 "Edge.Cuts" user)
+		(27 "Margin" user)
+		(31 "F.CrtYd" user "F.Courtyard")
+		(29 "B.CrtYd" user "B.Courtyard")
+		(35 "F.Fab" user)
+		(33 "B.Fab" user)
+		(39 "User.1" user)
+		(41 "User.2" user)
+		(43 "User.3" user)
+		(45 "User.4" user)
+	)
+	(setup
+		(pad_to_mask_clearance 0)
+		(allow_soldermask_bridges_in_footprints no)
+		(tenting
+			(front yes)
+			(back yes)
+		)
+		(covering
+			(front no)
+			(back no)
+		)
+		(plugging
+			(front no)
+			(back no)
+		)
+		(capping no)
+		(filling no)
+		(pcbplotparams
+			(layerselection 0x00000000_00000000_55555555_5755f5ff)
+			(plot_on_all_layers_selection 0x00000000_00000000_00000000_00000000)
+			(disableapertmacros no)
+			(usegerberextensions no)
+			(usegerberattributes yes)
+			(usegerberadvancedattributes yes)
+			(creategerberjobfile yes)
+			(dashed_line_dash_ratio 12)
+			(dashed_line_gap_ratio 3)
+			(svgprecision 4)
+			(plotframeref no)
+			(mode 1)
+			(useauxorigin no)
+			(pdf_front_fp_property_popups yes)
+			(pdf_back_fp_property_popups yes)
+			(pdf_metadata yes)
+			(pdf_single_document no)
+			(dxfpolygonmode yes)
+			(dxfimperialunits yes)
+			(dxfusepcbnewfont yes)
+			(psnegative no)
+			(psa4output no)
+			(plot_black_and_white yes)
+			(sketchpadsonfab no)
+			(plotpadnumbers no)
+			(hidednponfab no)
+			(sketchdnponfab yes)
+			(crossoutdnponfab yes)
+			(subtractmaskfromsilk no)
+			(outputformat 1)
+			(mirror no)
+			(drillshape 1)
+			(scaleselection 1)
+			(outputdirectory "")
+		)
+	)
+	(net 0 "")
+	(net 1 "GND")
+	(net 2 "Net-(R1-Pad6)")
+	(net 3 "VCC")
+	(footprint "Connector:Tag-Connect_TC2050-IDC-FP_2x05_P1.27mm_Vertical"
+		(layer "F.Cu")
+		(uuid "6be81952-937a-4957-9eb2-85721ef5e835")
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+			(uuid "d09f4d86-628e-4106-8571-3557d500000e")
+		)
+		(fp_line
+			(start -1.65 -0.825)
+			(end -0.825 -1.65)
+			(stroke
+				(width 0.1)
+				(type solid)
+			)
+			(layer "F.Fab")
+			(uuid "5a3a7862-c16f-49e9-a4a5-7301da652b4b")
+		)
+		(fp_line
+			(start -1.65 0.825)
+			(end -0.825 1.65)
+			(stroke
+				(width 0.1)
+				(type solid)
+			)
+			(layer "F.Fab")
+			(uuid "6f9a2956-13af-4d8c-a116-e81678cf86b7")
+		)
+		(fp_line
+			(start -1.110469 -0.8)
+			(end -0.810469 -0.8)
+			(stroke
+				(width 0.1)
+				(type solid)
+			)
+			(layer "F.Fab")
+			(uuid "6480eda9-f610-45f9-9815-aa694aa23157")
+		)
+		(fp_line
+			(start -0.960469 -0.95)
+			(end -0.960469 -0.65)
+			(stroke
+				(width 0.1)
+				(type solid)
+			)
+			(layer "F.Fab")
+			(uuid "2f8eccda-c7ba-4ac5-8b4a-1bdee552ce2e")
+		)
+		(fp_line
+			(start -0.825 -1.65)
+			(end 1.65 -1.65)
+			(stroke
+				(width 0.1)
+				(type solid)
+			)
+			(layer "F.Fab")
+			(uuid "26170f0f-c996-4313-a1ba-3f7eb878fcb0")
+		)
+		(fp_line
+			(start -0.825 1.65)
+			(end 1.65 1.65)
+			(stroke
+				(width 0.1)
+				(type solid)
+			)
+			(layer "F.Fab")
+			(uuid "dfac16eb-141f-4383-93a1-185012c558dc")
+		)
+		(fp_line
+			(start 1.65 -1.65)
+			(end 1.65 1.65)
+			(stroke
+				(width 0.1)
+				(type solid)
+			)
+			(layer "F.Fab")
+			(uuid "7ead1618-1e1b-485f-a82b-60b82c9a147a")
+		)
+		(fp_circle
+			(center 0 0)
+			(end 1.5 0)
+			(stroke
+				(width 0.1)
+				(type solid)
+			)
+			(fill no)
+			(layer "F.Fab")
+			(uuid "5ee3d052-a5df-4679-917d-290393b4ac4a")
+		)
+		(fp_text user "${REFERENCE}"
+			(at 0 0 0)
+			(layer "F.Fab")
+			(uuid "587b737e-6398-4d6d-9ee7-7db10fa2e562")
+			(effects
+				(font
+					(size 0.6 0.6)
+					(thickness 0.09)
+				)
+			)
+		)
+		(pad "1" smd roundrect
+			(at -1.5 0)
+			(size 2.2 1.6)
+			(layers "F.Cu" "F.Mask" "F.Paste")
+			(roundrect_rratio 0.15625)
+			(net 2 "Net-(R1-Pad6)")
+			(pintype "passive")
+			(tenting
+				(front none)
+				(back none)
+			)
+			(uuid "595baab1-9b66-41dd-838b-67f9f7f008e9")
+		)
+		(pad "2" smd roundrect
+			(at 1.5 0)
+			(size 2.2 1.6)
+			(layers "F.Cu" "F.Mask" "F.Paste")
+			(roundrect_rratio 0.15625)
+			(net 3 "VCC")
+			(pintype "passive")
+			(tenting
+				(front none)
+				(back none)
+			)
+			(uuid "d75d5164-5460-42c3-9d1d-54ff2da81393")
+		)
+		(embedded_fonts no)
+		(model "${KICAD8_3DMODEL_DIR}/Capacitor_SMD.3dshapes/CP_Elec_3x5.4.wrl"
+			(offset
+				(xyz 0 0 0)
+			)
+			(scale
+				(xyz 1 1 1)
+			)
+			(rotate
+				(xyz 0 0 0)
+			)
+		)
+	)
+	(embedded_fonts no)
+)

qa/data/pcbnew/stacked/stacked.kicad_pro

@@ -0,0 +1,632 @@
+{
+  "board": {
+    "3dviewports": [],
+    "design_settings": {
+      "defaults": {
+        "apply_defaults_to_fp_fields": false,
+        "apply_defaults_to_fp_shapes": false,
+        "apply_defaults_to_fp_text": false,
+        "board_outline_line_width": 0.05,
+        "copper_line_width": 0.2,
+        "copper_text_italic": false,
+        "copper_text_size_h": 1.5,
+        "copper_text_size_v": 1.5,
+        "copper_text_thickness": 0.3,
+        "copper_text_upright": false,
+        "courtyard_line_width": 0.05,
+        "dimension_precision": 4,
+        "dimension_units": 3,
+        "dimensions": {
+          "arrow_length": 1270000,
+          "extension_offset": 500000,
+          "keep_text_aligned": true,
+          "suppress_zeroes": true,
+          "text_position": 0,
+          "units_format": 0
+        },
+        "fab_line_width": 0.1,
+        "fab_text_italic": false,
+        "fab_text_size_h": 1.0,
+        "fab_text_size_v": 1.0,
+        "fab_text_thickness": 0.15,
+        "fab_text_upright": false,
+        "other_line_width": 0.1,
+        "other_text_italic": false,
+        "other_text_size_h": 1.0,
+        "other_text_size_v": 1.0,
+        "other_text_thickness": 0.15,
+        "other_text_upright": false,
+        "pads": {
+          "drill": 0.8,
+          "height": 1.27,
+          "width": 2.54
+        },
+        "silk_line_width": 0.1,
+        "silk_text_italic": false,
+        "silk_text_size_h": 1.0,
+        "silk_text_size_v": 1.0,
+        "silk_text_thickness": 0.1,
+        "silk_text_upright": false,
+        "zones": {
+          "min_clearance": 0.5
+        }
+      },
+      "diff_pair_dimensions": [],
+      "drc_exclusions": [],
+      "meta": {
+        "version": 2
+      },
+      "rule_severities": {
+        "annular_width": "error",
+        "clearance": "error",
+        "connection_width": "warning",
+        "copper_edge_clearance": "error",
+        "copper_sliver": "warning",
+        "courtyards_overlap": "error",
+        "creepage": "error",
+        "diff_pair_gap_out_of_range": "error",
+        "diff_pair_uncoupled_length_too_long": "error",
+        "drill_out_of_range": "error",
+        "duplicate_footprints": "warning",
+        "extra_footprint": "warning",
+        "footprint": "error",
+        "footprint_filters_mismatch": "ignore",
+        "footprint_symbol_mismatch": "warning",
+        "footprint_type_mismatch": "ignore",
+        "hole_clearance": "error",
+        "hole_to_hole": "warning",
+        "holes_co_located": "warning",
+        "invalid_outline": "error",
+        "isolated_copper": "warning",
+        "item_on_disabled_layer": "error",
+        "items_not_allowed": "error",
+        "length_out_of_range": "error",
+        "lib_footprint_issues": "warning",
+        "lib_footprint_mismatch": "warning",
+        "malformed_courtyard": "error",
+        "microvia_drill_out_of_range": "error",
+        "mirrored_text_on_front_layer": "warning",
+        "missing_courtyard": "ignore",
+        "missing_footprint": "warning",
+        "net_conflict": "warning",
+        "nonmirrored_text_on_back_layer": "warning",
+        "npth_inside_courtyard": "ignore",
+        "padstack": "warning",
+        "pth_inside_courtyard": "ignore",
+        "shorting_items": "error",
+        "silk_edge_clearance": "warning",
+        "silk_over_copper": "warning",
+        "silk_overlap": "warning",
+        "skew_out_of_range": "error",
+        "solder_mask_bridge": "error",
+        "starved_thermal": "error",
+        "text_height": "warning",
+        "text_on_edge_cuts": "error",
+        "text_thickness": "warning",
+        "through_hole_pad_without_hole": "error",
+        "too_many_vias": "error",
+        "track_angle": "error",
+        "track_dangling": "warning",
+        "track_segment_length": "error",
+        "track_width": "error",
+        "tracks_crossing": "error",
+        "unconnected_items": "error",
+        "unresolved_variable": "error",
+        "via_dangling": "warning",
+        "zones_intersect": "error"
+      },
+      "rules": {
+        "max_error": 0.005,
+        "min_clearance": 0.0,
+        "min_connection": 0.0,
+        "min_copper_edge_clearance": 0.5,
+        "min_groove_width": 0.0,
+        "min_hole_clearance": 0.25,
+        "min_hole_to_hole": 0.25,
+        "min_microvia_diameter": 0.2,
+        "min_microvia_drill": 0.1,
+        "min_resolved_spokes": 2,
+        "min_silk_clearance": 0.0,
+        "min_text_height": 0.8,
+        "min_text_thickness": 0.08,
+        "min_through_hole_diameter": 0.3,
+        "min_track_width": 0.0,
+        "min_via_annular_width": 0.1,
+        "min_via_diameter": 0.5,
+        "solder_mask_to_copper_clearance": 0.0,
+        "use_height_for_length_calcs": true
+      },
+      "teardrop_options": [
+        {
+          "td_onpthpad": true,
+          "td_onroundshapesonly": false,
+          "td_onsmdpad": true,
+          "td_ontrackend": false,
+          "td_onvia": true
+        }
+      ],
+      "teardrop_parameters": [
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_round_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_rect_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_track_end",
+          "td_width_to_size_filter_ratio": 0.9
+        }
+      ],
+      "track_widths": [],
+      "tuning_pattern_settings": {
+        "diff_pair_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 1.0
+        },
+        "diff_pair_skew_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 0.6
+        },
+        "single_track_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 0.6
+        }
+      },
+      "via_dimensions": [],
+      "zones_allow_external_fillets": false
+    },
+    "ipc2581": {
+      "dist": "",
+      "distpn": "",
+      "internal_id": "",
+      "mfg": "",
+      "mpn": ""
+    },
+    "layer_pairs": [],
+    "layer_presets": [],
+    "viewports": []
+  },
+  "boards": [],
+  "component_class_settings": {
+    "assignments": [],
+    "meta": {
+      "version": 0
+    },
+    "sheet_component_classes": {
+      "enabled": false
+    }
+  },
+  "cvpcb": {
+    "equivalence_files": []
+  },
+  "erc": {
+    "erc_exclusions": [],
+    "meta": {
+      "version": 0
+    },
+    "pin_map": [
+      [
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        1,
+        0,
+        0,
+        0,
+        0,
+        2
+      ],
+      [
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+        1,
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+        2,
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+      ],
+      [
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+      ],
+      [
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+      ],
+      [
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+      ],
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+      ],
+      [
+        1,
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+      ],
+      [
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+      ],
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+      ],
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+      ],
+      [
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+        2,
+        2,
+        2,
+        2,
+        2,
+        2,
+        2,
+        2,
+        2,
+        2,
+        2
+      ]
+    ],
+    "rule_severities": {
+      "bus_definition_conflict": "error",
+      "bus_entry_needed": "error",
+      "bus_to_bus_conflict": "error",
+      "bus_to_net_conflict": "error",
+      "different_unit_footprint": "error",
+      "different_unit_net": "error",
+      "duplicate_reference": "error",
+      "duplicate_sheet_names": "error",
+      "endpoint_off_grid": "warning",
+      "extra_units": "error",
+      "footprint_filter": "ignore",
+      "footprint_link_issues": "warning",
+      "four_way_junction": "ignore",
+      "ground_pin_not_ground": "warning",
+      "hier_label_mismatch": "error",
+      "isolated_pin_label": "warning",
+      "label_dangling": "error",
+      "label_multiple_wires": "warning",
+      "lib_symbol_issues": "warning",
+      "lib_symbol_mismatch": "warning",
+      "missing_bidi_pin": "warning",
+      "missing_input_pin": "warning",
+      "missing_power_pin": "error",
+      "missing_unit": "warning",
+      "multiple_net_names": "warning",
+      "net_not_bus_member": "warning",
+      "no_connect_connected": "warning",
+      "no_connect_dangling": "warning",
+      "pin_not_connected": "error",
+      "pin_not_driven": "error",
+      "pin_to_pin": "warning",
+      "power_pin_not_driven": "error",
+      "same_local_global_label": "warning",
+      "similar_label_and_power": "warning",
+      "similar_labels": "warning",
+      "similar_power": "warning",
+      "simulation_model_issue": "ignore",
+      "single_global_label": "ignore",
+      "stacked_pin_name": "warning",
+      "unannotated": "error",
+      "unconnected_wire_endpoint": "warning",
+      "undefined_netclass": "error",
+      "unit_value_mismatch": "error",
+      "unresolved_variable": "error",
+      "wire_dangling": "error"
+    }
+  },
+  "libraries": {
+    "pinned_footprint_libs": [],
+    "pinned_symbol_libs": []
+  },
+  "meta": {
+    "filename": "stacked.kicad_pro",
+    "version": 3
+  },
+  "net_settings": {
+    "classes": [
+      {
+        "bus_width": 12,
+        "clearance": 0.2,
+        "diff_pair_gap": 0.25,
+        "diff_pair_via_gap": 0.25,
+        "diff_pair_width": 0.2,
+        "line_style": 0,
+        "microvia_diameter": 0.3,
+        "microvia_drill": 0.1,
+        "name": "Default",
+        "pcb_color": "rgba(0, 0, 0, 0.000)",
+        "priority": 2147483647,
+        "schematic_color": "rgba(0, 0, 0, 0.000)",
+        "track_width": 0.2,
+        "tuning_profile": "",
+        "via_diameter": 0.6,
+        "via_drill": 0.3,
+        "wire_width": 6
+      }
+    ],
+    "meta": {
+      "version": 5
+    },
+    "net_colors": null,
+    "netclass_assignments": null,
+    "netclass_patterns": []
+  },
+  "pcbnew": {
+    "last_paths": {
+      "idf": "",
+      "netlist": "",
+      "plot": "",
+      "specctra_dsn": "",
+      "vrml": ""
+    },
+    "page_layout_descr_file": ""
+  },
+  "schematic": {
+    "annotate_start_num": 0,
+    "annotation": {
+      "method": 0,
+      "sort_order": 0
+    },
+    "bom_export_filename": "${PROJECTNAME}.csv",
+    "bom_fmt_presets": [],
+    "bom_fmt_settings": {
+      "field_delimiter": ",",
+      "keep_line_breaks": false,
+      "keep_tabs": false,
+      "name": "CSV",
+      "ref_delimiter": ",",
+      "ref_range_delimiter": "",
+      "string_delimiter": "\""
+    },
+    "bom_presets": [],
+    "bom_settings": {
+      "exclude_dnp": false,
+      "fields_ordered": [
+        {
+          "group_by": false,
+          "label": "Reference",
+          "name": "Reference",
+          "show": true
+        },
+        {
+          "group_by": false,
+          "label": "Qty",
+          "name": "${QUANTITY}",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "Value",
+          "name": "Value",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "DNP",
+          "name": "${DNP}",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "Exclude from BOM",
+          "name": "${EXCLUDE_FROM_BOM}",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "Exclude from Board",
+          "name": "${EXCLUDE_FROM_BOARD}",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "Footprint",
+          "name": "Footprint",
+          "show": true
+        },
+        {
+          "group_by": false,
+          "label": "Datasheet",
+          "name": "Datasheet",
+          "show": true
+        }
+      ],
+      "filter_string": "",
+      "group_symbols": true,
+      "include_excluded_from_bom": true,
+      "name": "Default Editing",
+      "sort_asc": true,
+      "sort_field": "Reference"
+    },
+    "connection_grid_size": 50.0,
+    "drawing": {
+      "dashed_lines_dash_length_ratio": 12.0,
+      "dashed_lines_gap_length_ratio": 3.0,
+      "default_line_thickness": 6.0,
+      "default_text_size": 50.0,
+      "field_names": [],
+      "hop_over_size_choice": 0,
+      "intersheets_ref_own_page": false,
+      "intersheets_ref_prefix": "",
+      "intersheets_ref_short": false,
+      "intersheets_ref_show": false,
+      "intersheets_ref_suffix": "",
+      "junction_size_choice": 3,
+      "label_size_ratio": 0.375,
+      "operating_point_overlay_i_precision": 3,
+      "operating_point_overlay_i_range": "~A",
+      "operating_point_overlay_v_precision": 3,
+      "operating_point_overlay_v_range": "~V",
+      "overbar_offset_ratio": 1.23,
+      "pin_symbol_size": 25.0,
+      "text_offset_ratio": 0.15
+    },
+    "legacy_lib_dir": "",
+    "legacy_lib_list": [],
+    "meta": {
+      "version": 1
+    },
+    "page_layout_descr_file": "",
+    "plot_directory": "",
+    "reuse_designators": true,
+    "subpart_first_id": 65,
+    "subpart_id_separator": 0,
+    "used_designators": "C1-2"
+  },
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+    "meta": {
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+  }
+}

qa/data/pcbnew/stacked/stacked.kicad_sch

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+		(instances
+			(project ""
+				(path "/f3609c98-5e8f-46ae-a21a-09d0b96782a9"
+					(reference "X1")
+					(unit 1)
+				)
+			)
+		)
+	)
+	(sheet_instances
+		(path "/"
+			(page "1")
+		)
+	)
+	(embedded_fonts no)
+)

qa/tests/eeschema/CMakeLists.txt

@@ -94,6 +94,10 @@ set( QA_EESCHEMA_SRCS
     test_sch_symbol.cpp
     test_schematic.cpp
     test_symbol_library_manager.cpp
+    test_stacked_pin_nomenclature.cpp
+    test_stacked_pin_conversion.cpp
+    test_pin_stacked_layout.cpp
+    test_netlist_exporter_xml_stacked.cpp
     test_resolve_drivers.cpp
     test_saveas_copy_subsheets.cpp
     test_update_items_connectivity.cpp

qa/tests/eeschema/test_netlist_exporter_xml_stacked.cpp

@@ -0,0 +1,150 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright The KiCad Developers
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 3
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one at
+ * http://www.gnu.org/licenses/
+ */
+
+#include <qa_utils/wx_utils/unit_test_utils.h>
+#include <schematic_utils/schematic_file_util.h>
+
+#include <set>
+#include <vector>
+
+#include <schematic.h>
+#include <settings/settings_manager.h>
+#include <netlist_exporter_xml.h>
+
+#include <wx/filename.h>
+#include <wx/xml/xml.h>
+
+struct XML_STACKED_PIN_FIXTURE
+{
+    XML_STACKED_PIN_FIXTURE() : m_settingsManager( true /* headless */ ) {}
+
+    SETTINGS_MANAGER           m_settingsManager;
+    std::unique_ptr<SCHEMATIC> m_schematic;
+};
+
+static std::set<wxString> as_set( const std::initializer_list<const char*>& init )
+{
+    std::set<wxString> out;
+    for( const char* s : init )
+        out.emplace( wxString::FromUTF8( s ) );
+    return out;
+}
+
+static wxXmlNode* find_child( wxXmlNode* parent, const wxString& name )
+{
+    for( wxXmlNode* child = parent->GetChildren(); child; child = child->GetNext() )
+    {
+        if( child->GetName() == name )
+            return child;
+    }
+
+    return nullptr;
+}
+
+static std::vector<wxXmlNode*> find_children( wxXmlNode* parent, const wxString& name )
+{
+    std::vector<wxXmlNode*> out;
+
+    for( wxXmlNode* child = parent->GetChildren(); child; child = child->GetNext() )
+    {
+        if( child->GetName() == name )
+            out.push_back( child );
+    }
+
+    return out;
+}
+
+BOOST_FIXTURE_TEST_CASE( NetlistExporterXML_StackedPinNomenclature, XML_STACKED_PIN_FIXTURE )
+{
+    // Load schematic with stacked pin numbers
+    KI_TEST::LoadSchematic( m_settingsManager, wxT( "stacked_pin_nomenclature" ), m_schematic );
+
+    // Write XML netlist to a test file next to the project
+    wxFileName netFile = m_schematic->Project().GetProjectFullName();
+    netFile.SetName( netFile.GetName() + wxT( "_xml_test" ) );
+    netFile.SetExt( wxT( "xml" ) );
+
+    if( wxFileExists( netFile.GetFullPath() ) )
+        wxRemoveFile( netFile.GetFullPath() );
+
+    WX_STRING_REPORTER reporter;
+    std::unique_ptr<NETLIST_EXPORTER_XML> exporter =
+            std::make_unique<NETLIST_EXPORTER_XML>( m_schematic.get() );
+
+    bool success = exporter->WriteNetlist( netFile.GetFullPath(), 0, reporter );
+    BOOST_REQUIRE( success && reporter.GetMessages().IsEmpty() );
+
+    // Parse the XML back
+    wxXmlDocument xdoc;
+    BOOST_REQUIRE( xdoc.Load( netFile.GetFullPath() ) );
+
+    wxXmlNode* root = xdoc.GetRoot();
+    BOOST_REQUIRE( root );
+
+    wxXmlNode* nets = find_child( root, wxT( "nets" ) );
+    BOOST_REQUIRE( nets );
+
+    // Collect pin sets for R1 on each power net
+    std::set<wxString> setA;
+    std::set<wxString> setB;
+    int                foundSets = 0;
+
+    for( wxXmlNode* net : find_children( nets, wxT( "net" ) ) )
+    {
+        wxString netName = net->GetAttribute( wxT( "name" ), wxEmptyString );
+        if( netName != wxT( "VCC" ) && netName != wxT( "GND" ) )
+            continue;
+
+        std::set<wxString>* target = ( foundSets == 0 ? &setA : &setB );
+
+        for( wxXmlNode* node : find_children( net, wxT( "node" ) ) )
+        {
+            if( node->GetAttribute( wxT( "ref" ), wxEmptyString ) != wxT( "R1" ) )
+                continue;
+
+            wxString pin = node->GetAttribute( wxT( "pin" ), wxEmptyString );
+            wxString pinfunction = node->GetAttribute( wxT( "pinfunction" ), wxEmptyString );
+            wxString pintype = node->GetAttribute( wxT( "pintype" ), wxEmptyString );
+
+            // Expect pinfunction to equal the expanded number when base name is empty
+            BOOST_CHECK_EQUAL( pinfunction, pin );
+            // Expect plain passive type (no +no_connect on these nets)
+            BOOST_CHECK_EQUAL( pintype, wxT( "passive" ) );
+
+            target->insert( pin );
+        }
+
+        foundSets++;
+    }
+
+    // We should have found two power nets with R1 nodes
+    BOOST_REQUIRE_EQUAL( foundSets, 2 );
+
+    // Expect one side to be 1..5 and the other to be 6,7,9,10,11 (order independent)
+    const std::set<wxString> expectedTop = as_set( { "1", "2", "3", "4", "5" } );
+    const std::set<wxString> expectedBot = as_set( { "6", "7", "9", "10", "11" } );
+
+    bool matchA = ( setA == expectedTop && setB == expectedBot );
+    bool matchB = ( setA == expectedBot && setB == expectedTop );
+    BOOST_CHECK( matchA || matchB );
+
+    // Cleanup test artifact
+    wxRemoveFile( netFile.GetFullPath() );
+}

qa/tests/eeschema/test_pin_stacked_layout.cpp

@@ -0,0 +1,543 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright The KiCad Developers, see AUTHORS.txt for contributors.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+/**
+ * @file test_pin_stacked_layout.cpp
+ * Test pin number layout for stacked multi-line numbers across all rotations
+ */
+
+#include <qa_utils/wx_utils/unit_test_utils.h>
+
+#include <sch_pin.h>
+#include <lib_symbol.h>
+#include <pin_layout_cache.h>
+#include <transform.h>
+#include <sch_io/sch_io_mgr.h>
+
+#include <wx/log.h>
+#include <boost/test/unit_test.hpp>
+
+BOOST_AUTO_TEST_SUITE( PinStackedLayout )
+
+/**
+ * Create a test symbol with stacked pin numbers for rotation testing
+ */
+static std::unique_ptr<LIB_SYMBOL> createTestResistorSymbol()
+{
+    auto symbol = std::make_unique<LIB_SYMBOL>( wxT( "TestResistor" ) );
+
+    // Create first pin with stacked numbers [1-5]
+    auto pin1 = std::make_unique<SCH_PIN>( symbol.get() );
+    pin1->SetPosition( VECTOR2I( 0, schIUScale.MilsToIU( 250 ) ) ); // top pin
+    pin1->SetOrientation( PIN_ORIENTATION::PIN_DOWN );
+    pin1->SetLength( schIUScale.MilsToIU( 50 ) );
+    pin1->SetNumber( wxT( "[1-5]" ) );
+    pin1->SetName( wxT( "A" ) ); // Short name
+    pin1->SetType( ELECTRICAL_PINTYPE::PT_PASSIVE );
+    pin1->SetUnit( 1 );
+
+    // Create second pin with stacked numbers [6,7,9-11]
+    auto pin2 = std::make_unique<SCH_PIN>( symbol.get() );
+    pin2->SetPosition( VECTOR2I( 0, schIUScale.MilsToIU( -340 ) ) ); // bottom pin
+    pin2->SetOrientation( PIN_ORIENTATION::PIN_UP );
+    pin2->SetLength( schIUScale.MilsToIU( 50 ) );
+    pin2->SetNumber( wxT( "[6,7,9-11]" ) );
+    pin2->SetName( wxT( "B" ) ); // Short name
+    pin2->SetType( ELECTRICAL_PINTYPE::PT_PASSIVE );
+    pin2->SetUnit( 1 );
+
+    // Add pins to symbol
+    symbol->AddDrawItem( pin1.release() );
+    symbol->AddDrawItem( pin2.release() );
+
+    return symbol;
+}
+
+/**
+ * Get pin geometry (line segment from connection point to pin end)
+ */
+static VECTOR2I getPinLineEnd( const SCH_PIN* pin, const TRANSFORM& transform )
+{
+    VECTOR2I start = pin->GetPosition();
+    VECTOR2I end = start;
+
+    int length = pin->GetLength();
+
+    switch( pin->PinDrawOrient( transform ) )
+    {
+    case PIN_ORIENTATION::PIN_UP:
+        end.y += length;
+        break;
+    case PIN_ORIENTATION::PIN_DOWN:
+        end.y -= length;
+        break;
+    case PIN_ORIENTATION::PIN_LEFT:
+        end.x -= length;
+        break;
+    case PIN_ORIENTATION::PIN_RIGHT:
+        end.x += length;
+        break;
+    case PIN_ORIENTATION::INHERIT:
+    default:
+        break;
+    }
+
+    return end;
+}
+
+/**
+ * Check if a box intersects with a line segment
+ */
+static bool boxIntersectsLine( const BOX2I& box, const VECTOR2I& lineStart, const VECTOR2I& lineEnd )
+{
+    // Simple bbox vs line segment intersection
+    // First check if line bbox intersects text bbox
+    BOX2I lineBbox;
+    lineBbox.SetOrigin( std::min( lineStart.x, lineEnd.x ), std::min( lineStart.y, lineEnd.y ) );
+    lineBbox.SetEnd( std::max( lineStart.x, lineEnd.x ), std::max( lineStart.y, lineEnd.y ) );
+
+    if( !lineBbox.Intersects( box ) )
+        return false;
+
+    // For vertical/horizontal lines, do precise check
+    if( lineStart.x == lineEnd.x ) // vertical line
+    {
+        int lineX = lineStart.x;
+        return ( lineX >= box.GetLeft() && lineX <= box.GetRight() &&
+                 box.GetTop() <= std::max( lineStart.y, lineEnd.y ) &&
+                 box.GetBottom() >= std::min( lineStart.y, lineEnd.y ) );
+    }
+    else if( lineStart.y == lineEnd.y ) // horizontal line
+    {
+        int lineY = lineStart.y;
+        return ( lineY >= box.GetBottom() && lineY <= box.GetTop() &&
+                 box.GetLeft() <= std::max( lineStart.x, lineEnd.x ) &&
+                 box.GetRight() >= std::min( lineStart.x, lineEnd.x ) );
+    }
+
+    // For diagonal lines, use the bbox intersection as approximation
+    return true;
+}
+
+/**
+ * Test that pin numbers don't overlap with pin geometry across all rotations
+ */
+BOOST_AUTO_TEST_CASE( PinNumbersNoOverlapAllRotations )
+{
+    // Create test symbol
+    auto symbol = createTestResistorSymbol();
+    BOOST_REQUIRE( symbol );
+
+    // Get the pins
+    std::vector<SCH_PIN*> pins;
+    for( auto& item : symbol->GetDrawItems() )
+    {
+        if( item.Type() == SCH_PIN_T )
+            pins.push_back( static_cast<SCH_PIN*>( &item ) );
+    }
+
+    BOOST_REQUIRE_EQUAL( pins.size(), 2 );
+
+    // Test rotations: 0°, 90°, 180°, 270°
+    std::vector<TRANSFORM> rotations = {
+        TRANSFORM( 1, 0, 0, 1 ),   // 0° (identity)
+        TRANSFORM( 0, -1, 1, 0 ),  // 90° CCW
+        TRANSFORM( -1, 0, 0, -1 ), // 180°
+        TRANSFORM( 0, 1, -1, 0 )   // 270° CCW (90° CW)
+    };
+
+    std::vector<wxString> rotationNames = { wxT("0°"), wxT("90°"), wxT("180°"), wxT("270°") };
+
+    for( size_t r = 0; r < rotations.size(); r++ )
+    {
+        const TRANSFORM& transform = rotations[r];
+        const wxString& rotName = rotationNames[r];
+
+        // Set global transform for this test
+        TRANSFORM oldTransform = DefaultTransform;
+        DefaultTransform = transform;
+
+        for( size_t p = 0; p < pins.size(); p++ )
+        {
+            SCH_PIN* pin = pins[p];
+
+            // Create layout cache for this pin
+            PIN_LAYOUT_CACHE cache( *pin );
+
+            // Get pin number text info (shadow width 0 for testing)
+            auto numberInfoOpt = cache.GetPinNumberInfo( 0 );
+
+            if( !numberInfoOpt.has_value() )
+                continue;
+
+            PIN_LAYOUT_CACHE::TEXT_INFO numberInfo = numberInfoOpt.value();
+
+            if( numberInfo.m_Text.IsEmpty() )
+                continue;
+
+            // Get pin line geometry
+            VECTOR2I pinStart = pin->GetPosition();
+            VECTOR2I pinEnd = getPinLineEnd( pin, transform );
+
+            // Get text bounding box - we need to estimate this since we don't have full font rendering
+            // For now, use a simple estimation based on text size and string length
+            int textHeight = numberInfo.m_TextSize;
+            int textWidth = numberInfo.m_Text.Length() * numberInfo.m_TextSize * 0.6; // rough char width
+
+            // Handle multi-line text
+            if( numberInfo.m_Text.Contains( '\n' ) )
+            {
+                wxArrayString lines;
+                wxStringSplit( numberInfo.m_Text, lines, '\n' );
+
+                if( numberInfo.m_Angle == ANGLE_VERTICAL )
+                {
+                    // For vertical text, lines are spaced horizontally
+                    int lineSpacing = textHeight * 1.3;
+                    textWidth = lines.size() * lineSpacing;
+                    // Find longest line for height
+                    size_t maxLen = 0;
+                    for( const wxString& line : lines )
+                        maxLen = std::max( maxLen, line.Length() );
+                    textHeight = maxLen * textHeight * 0.6;
+                }
+                else
+                {
+                    // For horizontal text, lines are spaced vertically
+                    int lineSpacing = textHeight * 1.3;
+                    textHeight = lines.size() * lineSpacing;
+                    // Find longest line for width
+                    size_t maxLen = 0;
+                    for( const wxString& line : lines )
+                        maxLen = std::max( maxLen, line.Length() );
+                    textWidth = maxLen * textHeight * 0.6;
+                }
+            }
+
+            // Create text bounding box around text position
+            BOX2I textBbox;
+            textBbox.SetOrigin( numberInfo.m_TextPosition.x - textWidth/2,
+                               numberInfo.m_TextPosition.y - textHeight/2 );
+            textBbox.SetSize( textWidth, textHeight );
+
+            // Check for intersection
+            bool overlaps = boxIntersectsLine( textBbox, pinStart, pinEnd );
+
+            // Log detailed info for debugging
+            wxLogMessage( wxT("Rotation %s, Pin %s: pos=(%d,%d) textPos=(%d,%d) pinLine=(%d,%d)-(%d,%d) textBox=(%d,%d,%dx%d) overlap=%s"),
+                         rotName, pin->GetNumber(),
+                         pinStart.x, pinStart.y,
+                         numberInfo.m_TextPosition.x, numberInfo.m_TextPosition.y,
+                         pinStart.x, pinStart.y, pinEnd.x, pinEnd.y,
+                         (int)textBbox.GetLeft(), (int)textBbox.GetTop(), (int)textBbox.GetWidth(), (int)textBbox.GetHeight(),
+                         overlaps ? wxT("YES") : wxT("NO") );
+
+            // Test assertion
+            BOOST_CHECK_MESSAGE( !overlaps,
+                                "Pin number '" << pin->GetNumber() << "' overlaps with pin geometry at rotation " << rotName );
+        }
+
+        // Restore original transform
+        DefaultTransform = oldTransform;
+    }
+}
+
+/**
+ * Test that multiline and non-multiline pin numbers/names are positioned consistently
+ * on the same side of the pin for each rotation
+ */
+BOOST_AUTO_TEST_CASE( PinTextConsistentSidePlacement )
+{
+    // Create test symbol with both types of pins
+    auto symbol = createTestResistorSymbol();
+    BOOST_REQUIRE( symbol );
+
+    // Get the pins - one will be multiline formatted, one will not
+    std::vector<SCH_PIN*> pins;
+    for( auto& item : symbol->GetDrawItems() )
+    {
+        if( item.Type() == SCH_PIN_T )
+            pins.push_back( static_cast<SCH_PIN*>( &item ) );
+    }
+
+    BOOST_REQUIRE_EQUAL( pins.size(), 2 );
+
+    // Test rotations
+    std::vector<TRANSFORM> rotations = {
+        TRANSFORM( 1, 0, 0, 1 ),   // 0° (identity)
+        TRANSFORM( 0, -1, 1, 0 ),  // 90° CCW
+        TRANSFORM( -1, 0, 0, -1 ), // 180°
+        TRANSFORM( 0, 1, -1, 0 )   // 270° CCW (90° CW)
+    };
+
+    std::vector<wxString> rotationNames = { wxT("0°"), wxT("90°"), wxT("180°"), wxT("270°") };
+
+    for( size_t r = 0; r < rotations.size(); r++ )
+    {
+        const TRANSFORM& transform = rotations[r];
+        const wxString& rotName = rotationNames[r];
+
+        // Set global transform for this test
+        TRANSFORM oldTransform = DefaultTransform;
+        DefaultTransform = transform;
+
+        // For each rotation, collect pin number and name positions relative to pin center
+        struct PinTextInfo {
+            VECTOR2I pinPos;
+            VECTOR2I numberPos;
+            VECTOR2I namePos;
+            wxString pinNumber;
+            bool isMultiline;
+        };
+
+        std::vector<PinTextInfo> pinInfos;
+
+        for( auto* pin : pins )
+        {
+            PinTextInfo info;
+            info.pinPos = pin->GetPosition();
+            info.pinNumber = pin->GetNumber();
+
+            // Create layout cache for this pin
+            PIN_LAYOUT_CACHE cache( *pin );
+
+            // Get number position (shadow width 0 for testing)
+            auto numberInfoOpt = cache.GetPinNumberInfo( 0 );
+            if( numberInfoOpt.has_value() )
+            {
+                auto numberInfo = numberInfoOpt.value();
+                info.numberPos = numberInfo.m_TextPosition;
+                info.isMultiline = numberInfo.m_Text.Contains( '\n' );
+            }
+
+            // Get name position
+            auto nameInfoOpt = cache.GetPinNameInfo( 0 );
+            if( nameInfoOpt.has_value() )
+            {
+                auto nameInfo = nameInfoOpt.value();
+                info.namePos = nameInfo.m_TextPosition;
+            }
+
+            pinInfos.push_back( info );
+
+            wxLogDebug( "Rotation %s, Pin %s: pos=(%d,%d) numberPos=(%d,%d) namePos=(%d,%d) multiline=%s",
+                       rotName, info.pinNumber,
+                       info.pinPos.x, info.pinPos.y,
+                       info.numberPos.x, info.numberPos.y,
+                       info.namePos.x, info.namePos.y,
+                       info.isMultiline ? wxT("YES") : wxT("NO") );
+        }
+
+        BOOST_REQUIRE_EQUAL( pinInfos.size(), 2 );
+
+        // New semantics:
+        //  * Vertical pins (UP/DOWN): numbers and names must be LEFT (x < pin.x)
+        //  * Horizontal pins (LEFT/RIGHT): numbers/names must be ABOVE (y < pin.y)
+        PIN_ORIENTATION orient = pins[0]->PinDrawOrient( DefaultTransform );
+
+        if( orient == PIN_ORIENTATION::PIN_UP || orient == PIN_ORIENTATION::PIN_DOWN )
+        {
+            for( const auto& inf : pinInfos )
+            {
+                BOOST_CHECK_MESSAGE( inf.numberPos.x < inf.pinPos.x,
+                    "At rotation " << rotName << ", number for pin " << inf.pinNumber << " not left of vertical pin." );
+                BOOST_CHECK_MESSAGE( inf.namePos.x < inf.pinPos.x,
+                    "At rotation " << rotName << ", name for pin " << inf.pinNumber << " not left of vertical pin." );
+            }
+        }
+        else if( orient == PIN_ORIENTATION::PIN_LEFT || orient == PIN_ORIENTATION::PIN_RIGHT )
+        {
+            for( const auto& inf : pinInfos )
+            {
+                BOOST_CHECK_MESSAGE( inf.numberPos.y < inf.pinPos.y,
+                    "At rotation " << rotName << ", number for pin " << inf.pinNumber << " not above horizontal pin." );
+                BOOST_CHECK_MESSAGE( inf.namePos.y < inf.pinPos.y,
+                    "At rotation " << rotName << ", name for pin " << inf.pinNumber << " not above horizontal pin." );
+            }
+        }
+
+        // Restore original transform
+        DefaultTransform = oldTransform;
+    }
+}
+
+/**
+ * Test that multiline and non-multiline pin numbers/names have the same bottom coordinate
+ * (distance from pin along the axis connecting pin and text)
+ */
+BOOST_AUTO_TEST_CASE( PinTextSameBottomCoordinate )
+{
+    // Create test symbol with both types of pins
+    auto symbol = createTestResistorSymbol();
+    BOOST_REQUIRE( symbol );
+
+    // Get the pins - one will be multiline formatted, one will not
+    std::vector<SCH_PIN*> pins;
+    for( auto& item : symbol->GetDrawItems() )
+    {
+        if( item.Type() == SCH_PIN_T )
+            pins.push_back( static_cast<SCH_PIN*>( &item ) );
+    }
+
+    BOOST_REQUIRE_EQUAL( pins.size(), 2 );
+
+    // Test rotations
+    std::vector<TRANSFORM> rotations = {
+        TRANSFORM( 1, 0, 0, 1 ),   // 0° (identity)
+        TRANSFORM( 0, -1, 1, 0 ),  // 90° CCW
+        TRANSFORM( -1, 0, 0, -1 ), // 180°
+        TRANSFORM( 0, 1, -1, 0 )   // 270° CCW (90° CW)
+    };
+
+    std::vector<wxString> rotationNames = { wxT("0°"), wxT("90°"), wxT("180°"), wxT("270°") };
+
+    for( size_t r = 0; r < rotations.size(); r++ )
+    {
+        const TRANSFORM& transform = rotations[r];
+        const wxString& rotName = rotationNames[r];
+
+        // Set global transform for this test
+        TRANSFORM oldTransform = DefaultTransform;
+        DefaultTransform = transform;
+
+        // For each rotation, collect pin and text position data
+        struct PinTextData {
+            VECTOR2I pinPos;
+            VECTOR2I numberPos;
+            VECTOR2I namePos;
+            wxString pinNumber;
+            bool isMultiline;
+            int numberBottomDistance;
+            int nameBottomDistance;
+        };
+
+        std::vector<PinTextData> pinData;
+
+        for( auto* pin : pins )
+        {
+            PinTextData data;
+            data.pinPos = pin->GetPosition();
+            data.pinNumber = pin->GetNumber();
+
+            // Create layout cache for this pin
+            PIN_LAYOUT_CACHE cache( *pin );
+
+            // Get number position (shadow width 0 for testing)
+            auto numberInfoOpt = cache.GetPinNumberInfo( 0 );
+            PIN_LAYOUT_CACHE::TEXT_INFO numberInfo; // store for later heuristics
+            if( numberInfoOpt.has_value() )
+            {
+                numberInfo = numberInfoOpt.value();
+                data.numberPos = numberInfo.m_TextPosition;
+                data.isMultiline = numberInfo.m_Text.Contains( '\n' );
+            }
+            else
+            {
+                BOOST_FAIL( "Expected pin number text info" );
+            }
+
+            // Get name position
+            auto nameInfoOpt = cache.GetPinNameInfo( 0 );
+            PIN_LAYOUT_CACHE::TEXT_INFO nameInfo; // store for width/height heuristic
+            if( nameInfoOpt.has_value() )
+            {
+                nameInfo = nameInfoOpt.value();
+                data.namePos = nameInfo.m_TextPosition;
+            }
+            else
+            {
+                BOOST_FAIL( "Expected pin name text info" );
+            }
+
+            // Calculate bottom distance (closest distance to pin along pin-text axis)
+            PIN_ORIENTATION orient = pin->PinDrawOrient( DefaultTransform );
+
+            if( orient == PIN_ORIENTATION::PIN_UP || orient == PIN_ORIENTATION::PIN_DOWN )
+            {
+                // Vertical pins: measure clearance from pin (at pin.x) to RIGHT edge of text box.
+                // We approximate half width from text length heuristic.
+                int textWidth = data.isMultiline ? 0 : (int)( data.pinNumber.Length() * numberInfo.m_TextSize * 0.6 );
+                // (Multiline case: numberInfo.m_Text already contains \n; heuristic in earlier section)
+                if( data.isMultiline )
+                {
+                    wxArrayString lines; wxStringSplit( numberInfo.m_Text, lines, '\n' );
+                    int lineSpacing = numberInfo.m_TextSize * 1.3;
+                    textWidth = lines.size() * lineSpacing; // when vertical orientation text is rotated
+                }
+                int rightEdge = data.numberPos.x + textWidth / 2;
+                data.numberBottomDistance = data.pinPos.x - rightEdge; // positive gap
+                int nameWidth = (int)( nameInfo.m_Text.Length() * nameInfo.m_TextSize * 0.6 );
+                int nameRightEdge = data.namePos.x + nameWidth / 2;
+                data.nameBottomDistance = data.pinPos.x - nameRightEdge; // expect similar across pins
+            }
+            else
+            {
+                // Horizontal pins: we align centers at a fixed offset above the pin. Measure center gap.
+                data.numberBottomDistance = data.pinPos.y - data.numberPos.y; // center gap constant
+                data.nameBottomDistance = data.pinPos.y - data.namePos.y;     // center gap for names
+            }
+
+            pinData.push_back( data );
+
+            wxLogDebug( "Rotation %s, Pin %s: pos=(%d,%d) numberPos=(%d,%d) namePos=(%d,%d) multiline=%s numberBottomDist=%d nameBottomDist=%d",
+                       rotName, data.pinNumber,
+                       data.pinPos.x, data.pinPos.y,
+                       data.numberPos.x, data.numberPos.y,
+                       data.namePos.x, data.namePos.y,
+                       data.isMultiline ? wxT("YES") : wxT("NO"),
+                       data.numberBottomDistance, data.nameBottomDistance );
+        }
+
+        BOOST_REQUIRE_EQUAL( pinData.size(), 2 );
+
+        // Check that both pins have their numbers at the same bottom distance from pin
+        // Allow small tolerance for rounding differences
+        const int tolerance = 100; // 100 internal units tolerance
+
+        int bottomDist1 = pinData[0].numberBottomDistance;
+        int bottomDist2 = pinData[1].numberBottomDistance;
+        int distanceDiff = abs( bottomDist1 - bottomDist2 );
+
+        BOOST_CHECK_MESSAGE( distanceDiff <= tolerance,
+                           "At rotation " << rotName << ", pin numbers have different bottom distances from pin. "
+                           << "Pin " << pinData[0].pinNumber << " distance=" << bottomDist1
+                           << ", Pin " << pinData[1].pinNumber << " distance=" << bottomDist2
+                           << ", difference=" << distanceDiff << " (tolerance=" << tolerance << ")" );
+
+        // Check that both pins have their names at the same bottom distance from pin
+        int nameBottomDist1 = pinData[0].nameBottomDistance;
+        int nameBottomDist2 = pinData[1].nameBottomDistance;
+        int nameDistanceDiff = abs( nameBottomDist1 - nameBottomDist2 );
+
+        BOOST_CHECK_MESSAGE( nameDistanceDiff <= tolerance,
+                           "At rotation " << rotName << ", pin names have different bottom distances from pin. "
+                           << "Pin " << pinData[0].pinNumber << " name distance=" << nameBottomDist1
+                           << ", Pin " << pinData[1].pinNumber << " name distance=" << nameBottomDist2
+                           << ", difference=" << nameDistanceDiff << " (tolerance=" << tolerance << ")" );
+
+        // Restore original transform
+        DefaultTransform = oldTransform;
+    }
+}
+
+BOOST_AUTO_TEST_SUITE_END()

qa/tests/eeschema/test_stacked_pin_conversion.cpp

@@ -0,0 +1,742 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2024 KiCad Developers
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <qa_utils/wx_utils/unit_test_utils.h>
+#include <sch_pin.h>
+#include <lib_symbol.h>
+#include <eeschema_test_utils.h>
+
+struct STACKED_PIN_CONVERSION_FIXTURE
+{
+    STACKED_PIN_CONVERSION_FIXTURE()
+    {
+        m_settingsManager = std::make_unique<SETTINGS_MANAGER>( true );
+        m_symbol = std::make_unique<LIB_SYMBOL>( "TestSymbol" );
+    }
+
+    std::unique_ptr<SETTINGS_MANAGER> m_settingsManager;
+    std::unique_ptr<LIB_SYMBOL>       m_symbol;
+};
+
+BOOST_FIXTURE_TEST_SUITE( StackedPinConversion, STACKED_PIN_CONVERSION_FIXTURE )
+
+
+/**
+ * Test basic stacked pin number expansion functionality
+ */
+BOOST_AUTO_TEST_CASE( TestStackedPinExpansion )
+{
+    // Test simple list notation
+    SCH_PIN* pin = new SCH_PIN( m_symbol.get() );
+    pin->SetNumber( wxT("[1,2,3]") );
+
+    bool isValid;
+    std::vector<wxString> expanded = pin->GetStackedPinNumbers( &isValid );
+
+    BOOST_CHECK( isValid );
+    BOOST_REQUIRE_EQUAL( expanded.size(), 3 );
+    BOOST_CHECK_EQUAL( expanded[0], "1" );
+    BOOST_CHECK_EQUAL( expanded[1], "2" );
+    BOOST_CHECK_EQUAL( expanded[2], "3" );
+
+    delete pin;
+
+    // Test range notation
+    pin = new SCH_PIN( m_symbol.get() );
+    pin->SetNumber( wxT("[5-7]") );
+
+    expanded = pin->GetStackedPinNumbers( &isValid );
+
+    BOOST_CHECK( isValid );
+    BOOST_REQUIRE_EQUAL( expanded.size(), 3 );
+    BOOST_CHECK_EQUAL( expanded[0], "5" );
+    BOOST_CHECK_EQUAL( expanded[1], "6" );
+    BOOST_CHECK_EQUAL( expanded[2], "7" );
+
+    delete pin;
+
+    // Test mixed notation
+    pin = new SCH_PIN( m_symbol.get() );
+    pin->SetNumber( wxT("[1,3,5-7]") );
+
+    expanded = pin->GetStackedPinNumbers( &isValid );
+
+    BOOST_CHECK( isValid );
+    BOOST_REQUIRE_EQUAL( expanded.size(), 5 );
+    BOOST_CHECK_EQUAL( expanded[0], "1" );
+    BOOST_CHECK_EQUAL( expanded[1], "3" );
+    BOOST_CHECK_EQUAL( expanded[2], "5" );
+    BOOST_CHECK_EQUAL( expanded[3], "6" );
+    BOOST_CHECK_EQUAL( expanded[4], "7" );
+
+    delete pin;
+}
+
+
+/**
+ * Test stacked pin validity checking
+ */
+BOOST_AUTO_TEST_CASE( TestStackedPinValidity )
+{
+    SCH_PIN* pin = new SCH_PIN( m_symbol.get() );
+
+    // Test valid single pin (should not be considered stacked)
+    pin->SetNumber( wxT("1") );
+    bool isValid;
+    std::vector<wxString> expanded = pin->GetStackedPinNumbers( &isValid );
+    BOOST_CHECK( isValid );
+    BOOST_CHECK_EQUAL( expanded.size(), 1 );
+    BOOST_CHECK_EQUAL( expanded[0], "1" );
+
+    // Test invalid notation (malformed brackets)
+    pin->SetNumber( wxT("[1,2") );
+    expanded = pin->GetStackedPinNumbers( &isValid );
+    BOOST_CHECK( !isValid );
+
+    // Test invalid range
+    pin->SetNumber( wxT("[5-3]") );  // backwards range
+    expanded = pin->GetStackedPinNumbers( &isValid );
+    BOOST_CHECK( !isValid );
+
+    // Test empty brackets
+    pin->SetNumber( wxT("[]") );
+    expanded = pin->GetStackedPinNumbers( &isValid );
+    BOOST_CHECK( !isValid );
+
+    delete pin;
+}
+
+
+/**
+ * Test pin creation and positioning for conversion tests
+ */
+BOOST_AUTO_TEST_CASE( TestPinCreation )
+{
+    // Create multiple pins at the same location
+    VECTOR2I position( 0, 0 );
+
+    SCH_PIN* pin1 = new SCH_PIN( m_symbol.get() );
+    pin1->SetNumber( wxT("1") );
+    pin1->SetPosition( position );
+    pin1->SetOrientation( PIN_ORIENTATION::PIN_RIGHT );
+
+    SCH_PIN* pin2 = new SCH_PIN( m_symbol.get() );
+    pin2->SetNumber( wxT("2") );
+    pin2->SetPosition( position );
+    pin2->SetOrientation( PIN_ORIENTATION::PIN_RIGHT );
+
+    SCH_PIN* pin3 = new SCH_PIN( m_symbol.get() );
+    pin3->SetNumber( wxT("3") );
+    pin3->SetPosition( position );
+    pin3->SetOrientation( PIN_ORIENTATION::PIN_RIGHT );
+
+    // Verify pins are at same location
+    BOOST_CHECK_EQUAL( pin1->GetPosition(), pin2->GetPosition() );
+    BOOST_CHECK_EQUAL( pin2->GetPosition(), pin3->GetPosition() );
+
+    // Test IsStacked functionality
+    BOOST_CHECK( pin1->IsStacked( pin2 ) );
+    BOOST_CHECK( pin2->IsStacked( pin3 ) );
+
+    delete pin1;
+    delete pin2;
+    delete pin3;
+}
+
+
+/**
+ * Test net name generation with stacked pins
+ */
+BOOST_AUTO_TEST_CASE( TestStackedPinNetNaming )
+{
+    SCH_PIN* pin = new SCH_PIN( m_symbol.get() );
+    pin->SetNumber( wxT("[8,9,10]") );
+
+    // This test would require a full SCH_SYMBOL context to test GetDefaultNetName
+    // For now just verify the pin number expansion works
+    bool isValid;
+    std::vector<wxString> expanded = pin->GetStackedPinNumbers( &isValid );
+
+    BOOST_CHECK( isValid );
+    BOOST_REQUIRE_EQUAL( expanded.size(), 3 );
+    // The smallest number should be first for deterministic net naming
+    BOOST_CHECK_EQUAL( expanded[0], "8" );
+
+    delete pin;
+}
+
+
+/**
+ * Test conversion from multiple co-located pins to stacked notation
+ */
+BOOST_AUTO_TEST_CASE( TestConvertMultiplePinsToStacked )
+{
+    // Create multiple pins at the same location
+    VECTOR2I position( 0, 0 );
+
+    SCH_PIN* pin1 = new SCH_PIN( m_symbol.get() );
+    pin1->SetNumber( wxT("1") );
+    pin1->SetPosition( position );
+    pin1->SetOrientation( PIN_ORIENTATION::PIN_RIGHT );
+    pin1->SetVisible( true );
+
+    SCH_PIN* pin2 = new SCH_PIN( m_symbol.get() );
+    pin2->SetNumber( wxT("2") );
+    pin2->SetPosition( position );
+    pin2->SetOrientation( PIN_ORIENTATION::PIN_RIGHT );
+    pin2->SetVisible( true );
+
+    SCH_PIN* pin3 = new SCH_PIN( m_symbol.get() );
+    pin3->SetNumber( wxT("3") );
+    pin3->SetPosition( position );
+    pin3->SetOrientation( PIN_ORIENTATION::PIN_RIGHT );
+    pin3->SetVisible( true );
+
+    // Test basic property access before adding to symbol
+    BOOST_CHECK_EQUAL( pin1->GetNumber(), "1" );
+    BOOST_CHECK_EQUAL( pin2->GetNumber(), "2" );
+    BOOST_CHECK_EQUAL( pin3->GetNumber(), "3" );
+
+    // Just test the basic conversion logic without symbol management
+    // Build the stacked notation string
+    wxString stackedNotation = wxT("[");
+    stackedNotation += pin1->GetNumber();
+    stackedNotation += wxT(",");
+    stackedNotation += pin2->GetNumber();
+    stackedNotation += wxT(",");
+    stackedNotation += pin3->GetNumber();
+    stackedNotation += wxT("]");
+
+    // Test stacked notation creation
+    BOOST_CHECK_EQUAL( stackedNotation, "[1,2,3]" );
+
+    // Set stacked notation on one pin
+    pin1->SetNumber( stackedNotation );
+    BOOST_CHECK_EQUAL( pin1->GetNumber(), "[1,2,3]" );
+
+    // Verify the stacked pin expansion works
+    bool isValid;
+    std::vector<wxString> expanded = pin1->GetStackedPinNumbers( &isValid );
+    BOOST_CHECK( isValid );
+    BOOST_REQUIRE_EQUAL( expanded.size(), 3 );
+    BOOST_CHECK_EQUAL( expanded[0], "1" );
+    BOOST_CHECK_EQUAL( expanded[1], "2" );
+    BOOST_CHECK_EQUAL( expanded[2], "3" );
+
+    // Clean up - delete pins manually since they're not in symbol
+    delete pin1;
+    delete pin2;
+    delete pin3;
+}
+
+
+/**
+ * Test range collapsing functionality in stacked pin conversion
+ */
+BOOST_AUTO_TEST_CASE( TestRangeCollapsingConversion )
+{
+    // Test range collapsing logic directly without symbol management
+
+    // Test consecutive pins that should collapse to a range
+    std::vector<long> numbers = { 1, 2, 3, 4 };
+
+    // Build collapsed ranges
+    wxString result;
+    size_t i = 0;
+    while( i < numbers.size() )
+    {
+        if( !result.IsEmpty() )
+            result += wxT(",");
+
+        long start = numbers[i];
+        long end = start;
+
+        // Find the end of consecutive sequence
+        while( i + 1 < numbers.size() && numbers[i + 1] == numbers[i] + 1 )
+        {
+            i++;
+            end = numbers[i];
+        }
+
+        // Add range or single number
+        if( end > start + 1 )  // Range of 3+ numbers
+            result += wxString::Format( wxT("%ld-%ld"), start, end );
+        else if( end == start + 1 )  // Two consecutive numbers
+            result += wxString::Format( wxT("%ld,%ld"), start, end );
+        else  // Single number
+            result += wxString::Format( wxT("%ld"), start );
+
+        i++;
+    }
+
+    // Verify range collapsing: 1,2,3,4 should become "1-4"
+    BOOST_CHECK_EQUAL( result, "1-4" );
+
+    // Test with mixed consecutive and non-consecutive: 1,2,3,4,7,8,9
+    numbers = { 1, 2, 3, 4, 7, 8, 9 };
+    result.Clear();
+    i = 0;
+
+    while( i < numbers.size() )
+    {
+        if( !result.IsEmpty() )
+            result += wxT(",");
+
+        long start = numbers[i];
+        long end = start;
+
+        // Find the end of consecutive sequence
+        while( i + 1 < numbers.size() && numbers[i + 1] == numbers[i] + 1 )
+        {
+            i++;
+            end = numbers[i];
+        }
+
+        // Add range or single number
+        if( end > start + 1 )  // Range of 3+ numbers
+            result += wxString::Format( wxT("%ld-%ld"), start, end );
+        else if( end == start + 1 )  // Two consecutive numbers
+            result += wxString::Format( wxT("%ld,%ld"), start, end );
+        else  // Single number
+            result += wxString::Format( wxT("%ld"), start );
+
+        i++;
+    }
+
+    // Verify mixed ranges: 1,2,3,4,7,8,9 should become "1-4,7-9"
+    BOOST_CHECK_EQUAL( result, "1-4,7-9" );
+
+    // Test edge cases
+    numbers = { 1, 3, 5 };  // Non-consecutive
+    result.Clear();
+    i = 0;
+
+    while( i < numbers.size() )
+    {
+        if( !result.IsEmpty() )
+            result += wxT(",");
+
+        long start = numbers[i];
+        long end = start;
+
+        // Find the end of consecutive sequence
+        while( i + 1 < numbers.size() && numbers[i + 1] == numbers[i] + 1 )
+        {
+            i++;
+            end = numbers[i];
+        }
+
+        // Add range or single number
+        if( end > start + 1 )  // Range of 3+ numbers
+            result += wxString::Format( wxT("%ld-%ld"), start, end );
+        else if( end == start + 1 )  // Two consecutive numbers
+            result += wxString::Format( wxT("%ld,%ld"), start, end );
+        else  // Single number
+            result += wxString::Format( wxT("%ld"), start );
+
+        i++;
+    }
+
+    // Verify non-consecutive: 1,3,5 should remain "1,3,5"
+    BOOST_CHECK_EQUAL( result, "1,3,5" );
+
+    // Test two consecutive numbers
+    numbers = { 5, 6 };
+    result.Clear();
+    i = 0;
+
+    while( i < numbers.size() )
+    {
+        if( !result.IsEmpty() )
+            result += wxT(",");
+
+        long start = numbers[i];
+        long end = start;
+
+        // Find the end of consecutive sequence
+        while( i + 1 < numbers.size() && numbers[i + 1] == numbers[i] + 1 )
+        {
+            i++;
+            end = numbers[i];
+        }
+
+        // Add range or single number
+        if( end > start + 1 )  // Range of 3+ numbers
+            result += wxString::Format( wxT("%ld-%ld"), start, end );
+        else if( end == start + 1 )  // Two consecutive numbers
+            result += wxString::Format( wxT("%ld,%ld"), start, end );
+        else  // Single number
+            result += wxString::Format( wxT("%ld"), start );
+
+        i++;
+    }
+
+    // Verify two consecutive: 5,6 should remain "5,6" (not convert to range)
+    BOOST_CHECK_EQUAL( result, "5,6" );
+
+    // Test complex mixed case: 1,2,4,5,6,8,9,10,11
+    numbers = { 1, 2, 4, 5, 6, 8, 9, 10, 11 };
+    result.Clear();
+    i = 0;
+
+    while( i < numbers.size() )
+    {
+        if( !result.IsEmpty() )
+            result += wxT(",");
+
+        long start = numbers[i];
+        long end = start;
+
+        // Find the end of consecutive sequence
+        while( i + 1 < numbers.size() && numbers[i + 1] == numbers[i] + 1 )
+        {
+            i++;
+            end = numbers[i];
+        }
+
+        // Add range or single number
+        if( end > start + 1 )  // Range of 3+ numbers
+            result += wxString::Format( wxT("%ld-%ld"), start, end );
+        else if( end == start + 1 )  // Two consecutive numbers
+            result += wxString::Format( wxT("%ld,%ld"), start, end );
+        else  // Single number
+            result += wxString::Format( wxT("%ld"), start );
+
+        i++;
+    }
+
+    // Verify complex case: 1,2,4,5,6,8,9,10,11 should become "1,2,4-6,8-11"
+    BOOST_CHECK_EQUAL( result, "1,2,4-6,8-11" );
+
+    // Test that our range notation can be expanded back correctly
+    SCH_PIN* rangePin = new SCH_PIN( m_symbol.get() );
+    rangePin->SetNumber( wxT("[1-4,7-9]") );
+
+    bool isValid;
+    std::vector<wxString> expanded = rangePin->GetStackedPinNumbers( &isValid );
+    BOOST_CHECK( isValid );
+    BOOST_REQUIRE_EQUAL( expanded.size(), 7 );
+
+    // Should expand to: 1,2,3,4,7,8,9
+    BOOST_CHECK_EQUAL( expanded[0], "1" );
+    BOOST_CHECK_EQUAL( expanded[1], "2" );
+    BOOST_CHECK_EQUAL( expanded[2], "3" );
+    BOOST_CHECK_EQUAL( expanded[3], "4" );
+    BOOST_CHECK_EQUAL( expanded[4], "7" );
+    BOOST_CHECK_EQUAL( expanded[5], "8" );
+    BOOST_CHECK_EQUAL( expanded[6], "9" );
+
+    delete rangePin;
+}
+
+
+/**
+ * Test round-trip conversion: multiple pins -> stacked -> multiple pins
+ */
+BOOST_AUTO_TEST_CASE( TestRoundTripConversion )
+{
+    // Create multiple pins at the same location
+    VECTOR2I position( 100, 200 );
+
+    SCH_PIN* pin5 = new SCH_PIN( m_symbol.get() );
+    pin5->SetNumber( wxT("5") );
+    pin5->SetPosition( position );
+    pin5->SetOrientation( PIN_ORIENTATION::PIN_LEFT );
+    pin5->SetType( ELECTRICAL_PINTYPE::PT_INPUT );
+    pin5->SetName( wxT("TestPin") );
+    pin5->SetVisible( true );
+
+    SCH_PIN* pin7 = new SCH_PIN( m_symbol.get() );
+    pin7->SetNumber( wxT("7") );
+    pin7->SetPosition( position );
+    pin7->SetOrientation( PIN_ORIENTATION::PIN_LEFT );
+    pin7->SetType( ELECTRICAL_PINTYPE::PT_INPUT );
+    pin7->SetName( wxT("TestPin") );
+    pin7->SetVisible( true );
+
+    SCH_PIN* pin9 = new SCH_PIN( m_symbol.get() );
+    pin9->SetNumber( wxT("9") );
+    pin9->SetPosition( position );
+    pin9->SetOrientation( PIN_ORIENTATION::PIN_LEFT );
+    pin9->SetType( ELECTRICAL_PINTYPE::PT_INPUT );
+    pin9->SetName( wxT("TestPin") );
+    pin9->SetVisible( true );
+
+    // Store original properties for comparison
+    PIN_ORIENTATION originalOrientation = pin5->GetOrientation();
+    ELECTRICAL_PINTYPE originalType = pin5->GetType();
+    wxString originalName = pin5->GetName();
+    int originalLength = pin5->GetLength();
+
+    // Step 1: Convert to stacked notation (simulating ConvertStackedPins)
+    std::vector<SCH_PIN*> pinsToConvert = { pin5, pin7, pin9 };
+
+    // Sort pins numerically
+    std::sort( pinsToConvert.begin(), pinsToConvert.end(),
+        []( SCH_PIN* a, SCH_PIN* b )
+        {
+            long numA, numB;
+            if( a->GetNumber().ToLong( &numA ) && b->GetNumber().ToLong( &numB ) )
+                return numA < numB;
+            return a->GetNumber() < b->GetNumber();
+        });
+
+    // Build stacked notation
+    wxString stackedNotation = wxT("[5,7,9]");
+    pinsToConvert[0]->SetNumber( stackedNotation );
+
+    // Remove other pins (don't delete them yet for testing)
+    SCH_PIN* stackedPin = pinsToConvert[0];
+
+    // Step 2: Verify stacked notation
+    bool isValid;
+    std::vector<wxString> expanded = stackedPin->GetStackedPinNumbers( &isValid );
+    BOOST_CHECK( isValid );
+    BOOST_REQUIRE_EQUAL( expanded.size(), 3 );
+    BOOST_CHECK_EQUAL( expanded[0], "5" );
+    BOOST_CHECK_EQUAL( expanded[1], "7" );
+    BOOST_CHECK_EQUAL( expanded[2], "9" );
+
+    // Step 3: Convert back to individual pins (simulating ExplodeStackedPin)
+    // Sort the stacked numbers (should already be sorted in our case)
+    std::sort( expanded.begin(), expanded.end(),
+        []( const wxString& a, const wxString& b )
+        {
+            long numA, numB;
+            if( a.ToLong( &numA ) && b.ToLong( &numB ) )
+                return numA < numB;
+            return a < b;
+        });
+
+    // Change the original pin to use the first (smallest) number and make it visible
+    stackedPin->SetNumber( expanded[0] );
+    stackedPin->SetVisible( true );
+
+    // Create additional pins for the remaining numbers and make them invisible
+    std::vector<SCH_PIN*> explodedPins;
+    explodedPins.push_back( stackedPin );
+
+    for( size_t i = 1; i < expanded.size(); ++i )
+    {
+        SCH_PIN* newPin = new SCH_PIN( m_symbol.get() );
+
+        // Copy all properties from the original pin
+        newPin->SetPosition( stackedPin->GetPosition() );
+        newPin->SetOrientation( stackedPin->GetOrientation() );
+        newPin->SetShape( stackedPin->GetShape() );
+        newPin->SetLength( stackedPin->GetLength() );
+        newPin->SetType( stackedPin->GetType() );
+        newPin->SetName( stackedPin->GetName() );
+        newPin->SetNumber( expanded[i] );
+        newPin->SetNameTextSize( stackedPin->GetNameTextSize() );
+        newPin->SetNumberTextSize( stackedPin->GetNumberTextSize() );
+        newPin->SetUnit( stackedPin->GetUnit() );
+        newPin->SetBodyStyle( stackedPin->GetBodyStyle() );
+        newPin->SetVisible( false );  // Make all other pins invisible
+
+        explodedPins.push_back( newPin );
+    }
+
+    // Step 4: Verify the round-trip conversion
+    BOOST_REQUIRE_EQUAL( explodedPins.size(), 3 );
+
+    // Check pin numbers
+    BOOST_CHECK_EQUAL( explodedPins[0]->GetNumber(), "5" );
+    BOOST_CHECK_EQUAL( explodedPins[1]->GetNumber(), "7" );
+    BOOST_CHECK_EQUAL( explodedPins[2]->GetNumber(), "9" );
+
+    // Check visibility (only first pin should be visible)
+    BOOST_CHECK( explodedPins[0]->IsVisible() );
+    BOOST_CHECK( !explodedPins[1]->IsVisible() );
+    BOOST_CHECK( !explodedPins[2]->IsVisible() );
+
+    // Check that properties were preserved
+    for( SCH_PIN* pin : explodedPins )
+    {
+        BOOST_CHECK_EQUAL( pin->GetPosition(), position );
+        BOOST_CHECK( pin->GetOrientation() == originalOrientation );
+        BOOST_CHECK( pin->GetType() == originalType );
+        BOOST_CHECK_EQUAL( pin->GetName(), originalName );
+        BOOST_CHECK_EQUAL( pin->GetLength(), originalLength );
+    }
+
+    // Clean up
+    for( size_t i = 1; i < explodedPins.size(); ++i )
+        delete explodedPins[i];
+    // Note: explodedPins[0] is the original stackedPin, don't delete twice
+}
+
+
+/**
+ * Test visibility behavior during conversions
+ */
+BOOST_AUTO_TEST_CASE( TestVisibilityHandling )
+{
+    // Create a single pin to test visibility handling
+    SCH_PIN* pin = new SCH_PIN( m_symbol.get() );
+    pin->SetNumber( wxT("[8,10,12]") );
+    pin->SetVisible( false );  // Start invisible
+
+    // Test expansion of stacked notation
+    bool isValid;
+    std::vector<wxString> expanded = pin->GetStackedPinNumbers( &isValid );
+    BOOST_CHECK( isValid );
+    BOOST_REQUIRE_EQUAL( expanded.size(), 3 );
+
+    // Sort expanded numbers
+    std::sort( expanded.begin(), expanded.end(),
+        []( const wxString& a, const wxString& b )
+        {
+            long numA, numB;
+            if( a.ToLong( &numA ) && b.ToLong( &numB ) )
+                return numA < numB;
+            return a < b;
+        });
+
+    // Verify sorted order is correct
+    BOOST_CHECK_EQUAL( expanded[0], "8" );
+    BOOST_CHECK_EQUAL( expanded[1], "10" );
+    BOOST_CHECK_EQUAL( expanded[2], "12" );
+
+    // Set the smallest pin number and make it visible
+    pin->SetNumber( expanded[0] );  // "8"
+    pin->SetVisible( true );        // Make visible
+
+    // Verify the smallest pin is visible and has correct number
+    BOOST_CHECK_EQUAL( pin->GetNumber(), "8" );
+    BOOST_CHECK( pin->IsVisible() );
+
+    // Clean up
+    delete pin;
+}
+
+
+/**
+ * Test alphanumeric range collapsing functionality
+ */
+BOOST_AUTO_TEST_CASE( TestAlphanumericRangeCollapsing )
+{
+    // Test the new alphanumeric prefix parsing logic
+
+    // Helper function to test prefix parsing
+    auto testPrefixParsing = []( const wxString& pinNumber ) -> std::pair<wxString, long>
+    {
+        wxString prefix;
+        long numValue = -1;
+
+        // Find where numeric part starts (scan from end)
+        size_t numStart = pinNumber.length();
+        for( int i = pinNumber.length() - 1; i >= 0; i-- )
+        {
+            if( !wxIsdigit( pinNumber[i] ) )
+            {
+                numStart = i + 1;
+                break;
+            }
+            if( i == 0 )  // All digits
+                numStart = 0;
+        }
+
+        if( numStart < pinNumber.length() )  // Has numeric suffix
+        {
+            prefix = pinNumber.Left( numStart );
+            wxString numericPart = pinNumber.Mid( numStart );
+            numericPart.ToLong( &numValue );
+        }
+
+        return std::make_pair( prefix, numValue );
+    };
+
+    // Test basic prefix parsing
+    auto [prefix1, num1] = testPrefixParsing( wxT("A1") );
+    BOOST_CHECK_EQUAL( prefix1, "A" );
+    BOOST_CHECK_EQUAL( num1, 1 );
+
+    auto [prefix2, num2] = testPrefixParsing( wxT("AB12") );
+    BOOST_CHECK_EQUAL( prefix2, "AB" );
+    BOOST_CHECK_EQUAL( num2, 12 );
+
+    auto [prefix3, num3] = testPrefixParsing( wxT("123") );
+    BOOST_CHECK_EQUAL( prefix3, "" );
+    BOOST_CHECK_EQUAL( num3, 123 );
+
+    auto [prefix4, num4] = testPrefixParsing( wxT("XYZ") );
+    BOOST_CHECK_EQUAL( prefix4, "" );  // No numeric suffix
+    BOOST_CHECK_EQUAL( num4, -1 );
+
+    // Test grouping logic with example: AA1,AA2,AA3,AB4,CD12,CD13,CD14
+    std::map<wxString, std::vector<long>> prefixGroups;
+    std::vector<wxString> testPins = { wxT("AA1"), wxT("AA2"), wxT("AA3"), wxT("AB4"), wxT("CD12"), wxT("CD13"), wxT("CD14") };
+
+    for( const wxString& pinNumber : testPins )
+    {
+        auto [prefix, numValue] = testPrefixParsing( pinNumber );
+        if( numValue != -1 )
+            prefixGroups[prefix].push_back( numValue );
+    }
+
+    // Verify grouping
+    BOOST_CHECK_EQUAL( prefixGroups.size(), 3 );
+    BOOST_CHECK_EQUAL( prefixGroups[wxT("AA")].size(), 3 );
+    BOOST_CHECK_EQUAL( prefixGroups[wxT("AB")].size(), 1 );
+    BOOST_CHECK_EQUAL( prefixGroups[wxT("CD")].size(), 3 );
+
+    // Build expected result: AA1-AA3,AB4,CD12-CD14
+    wxString expectedResult;
+    for( auto& [prefix, numbers] : prefixGroups )
+    {
+        if( !expectedResult.IsEmpty() )
+            expectedResult += wxT(",");
+
+        std::sort( numbers.begin(), numbers.end() );
+
+        size_t i = 0;
+        while( i < numbers.size() )
+        {
+            if( i > 0 )
+                expectedResult += wxT(",");
+
+            long start = numbers[i];
+            long end = start;
+
+            // Find consecutive sequence
+            while( i + 1 < numbers.size() && numbers[i + 1] == numbers[i] + 1 )
+            {
+                i++;
+                end = numbers[i];
+            }
+
+            // Format with prefix
+            if( end > start + 1 )  // Range of 3+ numbers
+                expectedResult += wxString::Format( wxT("%s%ld-%s%ld"), prefix, start, prefix, end );
+            else if( end == start + 1 )  // Two consecutive numbers
+                expectedResult += wxString::Format( wxT("%s%ld,%s%ld"), prefix, start, prefix, end );
+            else  // Single number
+                expectedResult += wxString::Format( wxT("%s%ld"), prefix, start );
+
+            i++;
+        }
+    }
+
+    // Should result in: AA1-AA3,AB4,CD12-CD14
+    BOOST_CHECK_EQUAL( expectedResult, "AA1-AA3,AB4,CD12-CD14" );
+}
+
+
+BOOST_AUTO_TEST_SUITE_END()

qa/tests/eeschema/test_stacked_pin_nomenclature.cpp

@@ -0,0 +1,101 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright The KiCad Developers
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 3
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one at
+ * http://www.gnu.org/licenses/
+ */
+
+#include <qa_utils/wx_utils/unit_test_utils.h>
+#include <schematic_utils/schematic_file_util.h>
+
+#include <algorithm>
+#include <vector>
+
+#include <schematic.h>
+#include <sch_screen.h>
+#include <sch_symbol.h>
+#include <sch_pin.h>
+#include <settings/settings_manager.h>
+#include <locale_io.h>
+
+struct STACKED_PIN_FIXTURE
+{
+    STACKED_PIN_FIXTURE() : m_settingsManager( true /* headless */ ) {}
+
+    SETTINGS_MANAGER           m_settingsManager;
+    std::unique_ptr<SCHEMATIC> m_schematic;
+};
+
+static std::vector<wxString> ToVector( const std::initializer_list<const char*>& init )
+{
+    std::vector<wxString> out;
+    for( const char* s : init )
+        out.emplace_back( wxString::FromUTF8( s ) );
+    return out;
+}
+
+BOOST_FIXTURE_TEST_CASE( StackedPinNomenclature_ExpandsCorrectly, STACKED_PIN_FIXTURE )
+{
+    LOCALE_IO dummy;
+
+    // Load the custom schematic with bracketed pin numbers
+    KI_TEST::LoadSchematic( m_settingsManager, "stacked_pin_nomenclature", m_schematic );
+
+    SCH_SHEET_LIST sheets = m_schematic->BuildSheetListSortedByPageNumbers();
+    BOOST_REQUIRE( sheets.size() >= 1 );
+    SCH_SCREEN*    screen = sheets.at( 0 ).LastScreen();
+
+    // Find the Device:R symbol on the sheet
+    SCH_SYMBOL* resistor = nullptr;
+    for( SCH_ITEM* item : screen->Items().OfType( SCH_SYMBOL_T ) )
+    {
+        SCH_SYMBOL* sym = static_cast<SCH_SYMBOL*>( item );
+        if( sym->GetSchSymbolLibraryName() == wxT( "Device:R" ) )
+        {
+            resistor = sym;
+            break;
+        }
+    }
+
+    BOOST_REQUIRE_MESSAGE( resistor, "Resistor symbol not found in test schematic" );
+
+    // Collect both pins (each with bracketed numbers)
+    std::vector<SCH_PIN*> rpins = resistor->GetPins( &sheets.at( 0 ) );
+    BOOST_REQUIRE_EQUAL( rpins.size(), 2 );
+
+    // For determinism, sort by local Y position
+    std::sort( rpins.begin(), rpins.end(), []( SCH_PIN* a, SCH_PIN* b ) {
+        return a->GetLocalPosition().y < b->GetLocalPosition().y;
+    } );
+
+    // Top pin is [1-5]
+    bool validTop = false;
+    std::vector<wxString> top = rpins[0]->GetStackedPinNumbers( &validTop );
+    BOOST_CHECK( validTop );
+    std::vector<wxString> expectedTop = ToVector( { "1", "2", "3", "4", "5" } );
+    BOOST_CHECK_EQUAL_COLLECTIONS( top.begin(), top.end(), expectedTop.begin(), expectedTop.end() );
+
+    // Bottom pin is [6,7,9-11]
+    bool validBot = false;
+    std::vector<wxString> bot = rpins[1]->GetStackedPinNumbers( &validBot );
+    BOOST_CHECK( validBot );
+    std::vector<wxString> expectedBot = ToVector( { "6", "7", "9", "10", "11" } );
+    BOOST_CHECK_EQUAL_COLLECTIONS( bot.begin(), bot.end(), expectedBot.begin(), expectedBot.end() );
+
+    // Total expanded count across both pins should be 10
+    size_t total = top.size() + bot.size();
+    BOOST_CHECK_EQUAL( total, 10 );
+}

qa/tests/pcbnew/CMakeLists.txt

@@ -51,6 +51,7 @@ set( QA_PCBNEW_SRCS
     test_shape_corner_radius.cpp
     test_pcb_grid_helper.cpp
     test_save_load.cpp
+    test_stacked_pin_netlist.cpp
     test_tracks_cleaner.cpp
     test_triangulation.cpp
     test_multichannel.cpp

qa/tests/pcbnew/test_stacked_pin_netlist.cpp

@@ -0,0 +1,266 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2024 KiCad Developers, see AUTHORS.txt for contributors.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#include <boost/test/unit_test.hpp>
+
+#include <netlist_reader/pcb_netlist.h>
+#include <lib_id.h>
+#include <board.h>
+#include <footprint.h>
+#include <pad.h>
+#include <pcb_io/kicad_sexpr/pcb_io_kicad_sexpr.h>
+#include <project.h>
+#include <settings/settings_manager.h>
+#include <wx/log.h>
+#include <qa_utils/utility_registry.h>
+#include <reporter.h>
+
+BOOST_AUTO_TEST_SUITE( StackedPinNetlist )
+
+
+/**
+ * Test that COMPONENT::GetNet properly handles stacked pin notation like [8,9,10]
+ * and finds individual pin numbers within the stacked group.
+ */
+BOOST_AUTO_TEST_CASE( TestStackedPinNetMatch )
+{
+    // Create a component with a stacked pin notation
+    LIB_ID fpid( wxT( "TestLib" ), wxT( "TestFootprint" ) );
+    wxString reference = wxT( "U1" );
+    wxString value = wxT( "TestIC" );
+    KIID_PATH path;
+    std::vector<KIID> kiids;
+
+    COMPONENT component( fpid, reference, value, path, kiids );
+
+    // Add a net with stacked pin notation [8,9,10]
+    component.AddNet( wxT( "[8,9,10]" ), wxT( "DATA_BUS" ), wxT( "bidirectional" ), wxT( "bidirectional" ) );
+
+    // Test that individual pins within the stack are found
+    const COMPONENT_NET& net8 = component.GetNet( wxT( "8" ) );
+    const COMPONENT_NET& net9 = component.GetNet( wxT( "9" ) );
+    const COMPONENT_NET& net10 = component.GetNet( wxT( "10" ) );
+
+    BOOST_CHECK( net8.IsValid() );
+    BOOST_CHECK( net9.IsValid() );
+    BOOST_CHECK( net10.IsValid() );
+
+    BOOST_CHECK_EQUAL( net8.GetNetName(), wxString( "DATA_BUS" ) );
+    BOOST_CHECK_EQUAL( net9.GetNetName(), wxString( "DATA_BUS" ) );
+    BOOST_CHECK_EQUAL( net10.GetNetName(), wxString( "DATA_BUS" ) );
+
+    // Test that pins outside the stack are not found
+    const COMPONENT_NET& net7 = component.GetNet( wxT( "7" ) );
+    const COMPONENT_NET& net11 = component.GetNet( wxT( "11" ) );
+
+    BOOST_CHECK( !net7.IsValid() );
+    BOOST_CHECK( !net11.IsValid() );
+}
+
+
+/**
+ * Test stacked pin notation with range syntax [1-4]
+ */
+BOOST_AUTO_TEST_CASE( TestStackedPinRangeMatch )
+{
+    LIB_ID fpid( wxT( "TestLib" ), wxT( "TestFootprint" ) );
+    wxString reference = wxT( "U2" );
+    wxString value = wxT( "TestIC" );
+    KIID_PATH path;
+    std::vector<KIID> kiids;
+
+    COMPONENT component( fpid, reference, value, path, kiids );
+
+    // Add a net with range notation [1-4]
+    component.AddNet( wxT( "[1-4]" ), wxT( "POWER_BUS" ), wxT( "power_in" ), wxT( "power_in" ) );
+
+    // Test that all pins in the range are found
+    for( int i = 1; i <= 4; i++ )
+    {
+        const COMPONENT_NET& net = component.GetNet( wxString::Format( wxT( "%d" ), i ) );
+        BOOST_CHECK( net.IsValid() );
+        BOOST_CHECK_EQUAL( net.GetNetName(), wxString( "POWER_BUS" ) );
+    }
+
+    // Test pins outside the range
+    const COMPONENT_NET& net0 = component.GetNet( wxT( "0" ) );
+    const COMPONENT_NET& net5 = component.GetNet( wxT( "5" ) );
+
+    BOOST_CHECK( !net0.IsValid() );
+    BOOST_CHECK( !net5.IsValid() );
+}
+
+
+/**
+ * Test mixed notation [1,3,5-7]
+ */
+BOOST_AUTO_TEST_CASE( TestStackedPinMixedMatch )
+{
+    LIB_ID fpid( wxT( "TestLib" ), wxT( "TestFootprint" ) );
+    wxString reference = wxT( "U3" );
+    wxString value = wxT( "TestIC" );
+    KIID_PATH path;
+    std::vector<KIID> kiids;
+
+    COMPONENT component( fpid, reference, value, path, kiids );
+
+    // Add a net with mixed notation [1,3,5-7]
+    component.AddNet( wxT( "[1,3,5-7]" ), wxT( "CONTROL_BUS" ), wxT( "output" ), wxT( "output" ) );
+
+    // Test individual pins and ranges
+    std::vector<int> expectedPins = { 1, 3, 5, 6, 7 };
+    for( int pin : expectedPins )
+    {
+        const COMPONENT_NET& net = component.GetNet( wxString::Format( wxT( "%d" ), pin ) );
+        BOOST_CHECK( net.IsValid() );
+        BOOST_CHECK_EQUAL( net.GetNetName(), wxString( "CONTROL_BUS" ) );
+    }
+
+    // Test pins that should not be found
+    std::vector<int> unexpectedPins = { 2, 4, 8 };
+    for( int pin : unexpectedPins )
+    {
+        const COMPONENT_NET& net = component.GetNet( wxString::Format( wxT( "%d" ), pin ) );
+        BOOST_CHECK( !net.IsValid() );
+    }
+}
+
+
+/**
+ * Test that regular (non-stacked) pin names still work
+ */
+BOOST_AUTO_TEST_CASE( TestRegularPinMatch )
+{
+    LIB_ID fpid( wxT( "TestLib" ), wxT( "TestFootprint" ) );
+    wxString reference = wxT( "R1" );
+    wxString value = wxT( "1k" );
+    KIID_PATH path;
+    std::vector<KIID> kiids;
+
+    COMPONENT component( fpid, reference, value, path, kiids );
+
+    // Add regular pins
+    component.AddNet( wxT( "1" ), wxT( "VCC" ), wxT( "passive" ), wxT( "passive" ) );
+    component.AddNet( wxT( "2" ), wxT( "GND" ), wxT( "passive" ), wxT( "passive" ) );
+
+    const COMPONENT_NET& net1 = component.GetNet( wxT( "1" ) );
+    const COMPONENT_NET& net2 = component.GetNet( wxT( "2" ) );
+
+    BOOST_CHECK( net1.IsValid() );
+    BOOST_CHECK( net2.IsValid() );
+    BOOST_CHECK_EQUAL( net1.GetNetName(), wxString( "VCC" ) );
+    BOOST_CHECK_EQUAL( net2.GetNetName(), wxString( "GND" ) );
+}
+
+
+/**
+ * This test creates a mock netlist that matches the stacked project structure and
+ * validates that PCB pad lookups work correctly with stacked pin notation.
+ */
+BOOST_AUTO_TEST_CASE( TestStackedProjectNetlistUpdate )
+{
+    BOOST_TEST_MESSAGE( "Testing stacked pin project netlist functionality" );
+
+    // Create a component that matches the R1 component from the stacked project
+    LIB_ID fpid( wxT( "Connector" ), wxT( "Tag-Connect_TC2050-IDC-FP_2x05_P1.27mm_Vertical" ) );
+    wxString reference = wxT( "R1" );
+    wxString value = wxT( "R" );
+    KIID_PATH path;
+    std::vector<KIID> kiids;
+
+    COMPONENT component( fpid, reference, value, path, kiids );
+
+    // Add nets matching the stacked project
+    // The schematic has two stacked pin groups: [1-5] and [6,7,9-11]
+    component.AddNet( wxT( "[1-5]" ), wxT( "Net-(R1-Pad1)" ), wxT( "passive" ), wxT( "passive" ) );
+    component.AddNet( wxT( "[6,7,9-11]" ), wxT( "Net-(R1-Pad6)" ), wxT( "passive" ), wxT( "passive" ) );
+
+    BOOST_TEST_MESSAGE( "Created R1 component with stacked pins [1-5] and [6,7,9-11]" );
+
+    // Log all nets for the component
+    BOOST_TEST_MESSAGE( "R1 component nets:" );
+    for( unsigned i = 0; i < component.GetNetCount(); i++ )
+    {
+        const COMPONENT_NET& net = component.GetNet( i );
+        BOOST_TEST_MESSAGE( "  Pin: " + net.GetPinName() + " -> Net: " + net.GetNetName() );
+    }
+
+    // Test individual pin lookups
+    // Pins 1-5 should be found (they're in the [1-5] stacked group)
+    for( int pin = 1; pin <= 5; pin++ )
+    {
+        wxString pinStr = wxString::Format( wxT( "%d" ), pin );
+        const COMPONENT_NET& net = component.GetNet( pinStr );
+
+        BOOST_CHECK_MESSAGE( net.IsValid(),
+                            "Pin " + pinStr + " should be found in stacked group [1-5]" );
+
+        if( net.IsValid() )
+        {
+            BOOST_CHECK_EQUAL( net.GetNetName(), wxString( "Net-(R1-Pad1)" ) );
+            BOOST_TEST_MESSAGE( "Pin " + pinStr + " found with net: " + net.GetNetName() );
+        }
+        else
+        {
+            BOOST_TEST_MESSAGE( "Pin " + pinStr + " NOT found (should be in [1-5])" );
+        }
+    }
+
+    // Pins 6,7,9,10,11 should be found (they're in the [6,7,9-11] stacked group)
+    std::vector<int> groupTwoPins = { 6, 7, 9, 10, 11 };
+    for( int pin : groupTwoPins )
+    {
+        wxString pinStr = wxString::Format( wxT( "%d" ), pin );
+        const COMPONENT_NET& net = component.GetNet( pinStr );
+
+        BOOST_CHECK_MESSAGE( net.IsValid(),
+                            "Pin " + pinStr + " should be found in stacked group [6,7,9-11]" );
+
+        if( net.IsValid() )
+        {
+            BOOST_CHECK_EQUAL( net.GetNetName(), wxString( "Net-(R1-Pad6)" ) );
+            BOOST_TEST_MESSAGE( "Pin " + pinStr + " found with net: " + net.GetNetName() );
+        }
+        else
+        {
+            BOOST_TEST_MESSAGE( "Pin " + pinStr + " NOT found (should be in [6,7,9-11])" );
+        }
+    }
+
+    // Pin 8 should NOT be found (it's not in either stacked group)
+    const COMPONENT_NET& net8 = component.GetNet( wxT( "8" ) );
+    BOOST_CHECK_MESSAGE( !net8.IsValid(),
+                        "Pin 8 should NOT be found (not in any stacked group)" );
+
+    if( net8.IsValid() )
+    {
+        BOOST_TEST_MESSAGE( "Pin 8 unexpectedly found with net: " + net8.GetNetName() );
+    }
+    else
+    {
+        BOOST_TEST_MESSAGE( "Pin 8 correctly NOT found (expected behavior)" );
+    }
+}
+
+
+BOOST_AUTO_TEST_SUITE_END()